Microsoft-Windows-Directory-Services-SAM
112 events across 1 channel
Event ID 12288: SAM failed to write changes to the database.
#Description
SAM failed to write changes to the database. This is most likely due to a memory or disk-space shortage. The SAM database will be restored to an earlier state. Recent changes will be lost. Check the disk-space available and maximum pagefile size setting.
Message #
Fields #
| Name | Description |
|---|---|
__binLength UInt32 | |
ErrorCode Binary |
Event ID 12289: SAM failed to restore the database to an earlier state.
#Event ID 12290: SAM failed to update the SAM database.
#Description
SAM failed to update the SAM database. It will try again next time you reboot the machine.
Message #
Event ID 12291: SAM failed to start the TCP/IP or SPX/IPX listening thread
#Event ID 12292: There are two or more objects that have the same account name attribute in the SAM database.
#Event ID 12293: There are two or more objects that have the same SID attribute in the SAM database.
#Description
There are two or more objects that have the same SID attribute in the SAM database. The Distinguished Name of the account is AccountDistinguishedName. All duplicate accounts have been deleted. Check the event log for additional duplicates.
Message #
Fields #
| Name | Description |
|---|---|
AccountDistinguishedName UnicodeString |
Event ID 12294: The SAM database was unable to lockout the account of UserName due to a resource error, such as a hard disk write failure.
#Description
The SAM database was unable to lockout the account of UserName due to a resource error, such as a hard disk write failure (the specific error code is in the error data) . Accounts are locked after a certain number of bad passwords are provided so please consider resetting the password of the account mentioned above.
Message #
Fields #
| Name | Description |
|---|---|
UserName UnicodeString | |
__binLength UInt32 | |
ErrorCode Binary |
Event ID 12295: The SAM database attempted to delete the file FilePath as it contains account information that is no longer used.
#Event ID 12296: The SAM database attempted to clear the directory DirectoryPath in order to remove files that were once used by the Directory Service.
#Description
The SAM database attempted to clear the directory DirectoryPath in order to remove files that were once used by the Directory Service. The error is in record data. Please have an admin delete these files.
Message #
Fields #
| Name | Description |
|---|---|
DirectoryPath UnicodeString | |
__binLength UInt32 | |
WinError Binary |
Event ID 12297: ComputerName is now the primary domain controller for the domain.
#Event ID 12298: The account ComputerName cannot be converted to be a domain controller account as its object class attribute in the directory is not computer or is not deriv...
#Description
The account ComputerName cannot be converted to be a domain controller account as its object class attribute in the directory is not computer or is not derived from computer. If this is caused by an attempt to install a pre Windows 2000 domain controller in a Windows 2000 domain or later, then you should pre-create the account for the domain controller with the correct object class.
Message #
Fields #
| Name | Description |
|---|---|
ComputerName UnicodeString |
Event ID 12299: The attempt to check whether group caching has been enabled in the Security Accounts Manager has failed, most likely due to lack of resources.
#Event ID 12300: The group caching option in the Security Accounts Manager has now been properly updated.
#Description
The group caching option in the Security Accounts Manager has now been properly updated. Group caching is enabled.
Message #
Event ID 12301: The group caching option in the Security Accounts Manager has now been properly updated.
#Description
The group caching option in the Security Accounts Manager has now been properly updated. Group caching is disabled.
Message #
Event ID 12302: The SecurityPackage package failed to update additional credentials for user UserName.
#Event ID 12303: There are two or more well known objects that have the same SID attribute in the SAM database.
#Description
There are two or more well known objects that have the same SID attribute in the SAM database. The Distinguished Name of the duplicate account is AccountDistinguishedName. The newest account will be kept, all older duplicate accounts have been deleted. Check the event log for additional duplicates.
Message #
Fields #
| Name | Description |
|---|---|
AccountDistinguishedName UnicodeString |
Event ID 12304: There are two or more objects that have the same account name attribute in the SAM database.
#Description
There are two or more objects that have the same account name attribute in the SAM database. The system has automatically renamed object AccountDistinguishedName to a system assigned account name SystemAssignedAccountName.
Message #
Fields #
| Name | Description |
|---|---|
AccountDistinguishedName UnicodeString | |
SystemAssignedAccountName UnicodeString |
Event ID 12305: An error occurred while creating new default accounts for this domain.
#Description
An error occurred while creating new default accounts for this domain. This maybe due to a transient error condition. The task will retry periodically until success and will log this message again in a week if the problem persists.
Message #
Fields #
| Name | Description |
|---|---|
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16384: The account AccountName could not be upgraded since there is an account with an equivalent name.
#Event ID 16385: An error occurred upgrading user UserName.
#Event ID 16386: An error occurred trying to read a user object from the old database.
#Event ID 16387: An error occurred upgrading alias GroupName.
#Event ID 16388: An error occurred trying to read an alias object from the old database.
#Event ID 16389: An error occurred upgrading group GroupName.
#Event ID 16390: An error occurred trying to read a group object from the old database.
#Event ID 16391: An error occurred trying to add account AccountDistinguishedName to alias GroupName.
#Event ID 16392: The account with the sid AccountSID could not be added to group AccountDistinguishedName.
#Event ID 16393: An error occurred trying to add account AccountDistinguishedName to group GroupName.
#Event ID 16394: The account with the rid AccountRID could not be added to group GroupName.
#Event ID 16395: A fatal error occurred trying to transfer the SAM account database into the directory service.
#Event ID 16397: Setting the administrator's password to the string you specified failed.
#Description
Setting the administrator's password to the string you specified failed. Upon reboot the password will be blank; please reset once logged on.
Message #
Event ID 16398: An error occurred trying to upgrade a SAM user's User_Parameters attribute.
#Description
An error occurred trying to upgrade a SAM user's User_Parameters attribute. The following Notification Package DLL might be the possible offender: SecurityPackage. Check the record data of this event for the NT error code.
Message #
Fields #
| Name | Description |
|---|---|
SecurityPackage UnicodeString | |
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16399: An error occured trying to set User Parameters attribute for this user This operation is failed.
#Event ID 16400: An error occured trying to upgrade the following SAM User Object - UserName.
#Description
An error occured trying to upgrade the following SAM User Object - UserName. We will try to continue upgrading this user. But it might contain inconsistent data. Check the record data of this event for the NT error code.
Message #
Fields #
| Name | Description |
|---|---|
UserName UnicodeString | |
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16401: An error occurred when trying to add the account Name to the group AccountName.
#Description
An error occurred when trying to add the account Name to the group AccountName. The problem, "GroupName", occurred when trying to open the group. Please add the account manually.
Message #
Fields #
| Name | Description |
|---|---|
AccountName UnicodeString | |
GroupName UnicodeString | |
ErrorMessage UnicodeString | |
__binLength | |
ErrorCode |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE",
"event_source_name": "",
"event_id": 16401,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": 9223372036854775808,
"time_created": "2022-04-07T08:14:31.641248+00:00",
"event_record_id": 628,
"correlation": {},
"execution": {
"process_id": 648,
"thread_id": 652
},
"channel": "System",
"computer": "WIN-FPV0DSIC9O6.lab.local",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {
"Name": "SAMMSG_MEMBERSHIP_SETUP_ERROR_NO_GROUP",
"AccountName": "INTERNET USER",
"GroupName": "IIS_IUSRS",
"ErrorMessage": "The specified local group does not exist.\r\n",
"Binary": "60050000"
},
"message": ""
}
References #
- Example event sourced from https://github.com/NextronSystems/evtx-baseline
Event ID 16402: An error occurred when trying to add the account AccountName to the group GroupName.
#Description
An error occurred when trying to add the account AccountName to the group GroupName. The problem, "ErrorMessage", occurred when trying to add the account to the group. Please add the account manually.
Message #
Fields #
| Name | Description |
|---|---|
AccountName UnicodeString | |
GroupName UnicodeString | |
ErrorMessage UnicodeString | |
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16403: The error "AccountName" occurred when trying to create the well known account Name.
#Description
The error "AccountName" occurred when trying to create the well known account Name. Please contact PSS to recover.
Message #
Fields #
| Name | Description |
|---|---|
AccountName UnicodeString | |
ErrorMessage UnicodeString | |
__binLength | |
ErrorCode |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE",
"event_source_name": "",
"event_id": 16403,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": 9223372036854775808,
"time_created": "2022-04-07T08:14:31.644632+00:00",
"event_record_id": 638,
"correlation": {},
"execution": {
"process_id": 648,
"thread_id": 652
},
"channel": "System",
"computer": "WIN-FPV0DSIC9O6.lab.local",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {
"Name": "SAMMSG_USER_SETUP_ERROR",
"AccountName": "WDAGUtilityAccount",
"ErrorMessage": "The specified network password is not correct.\r\n",
"Binary": "56000000"
},
"message": ""
}
References #
- Example event sourced from https://github.com/NextronSystems/evtx-baseline
Event ID 16404: The Security Accounts Manager failed to add the Enterprise Admins group to the local Administrators alias.
#Description
The Security Accounts Manager failed to add the Enterprise Admins group to the local Administrators alias. To ensure proper functioning of the domain; please add the account manually.
Message #
Event ID 16405: During the installation of the Directory Service, this server's machine account was deleted hence preventing this Domain Controller from starting up.
#Event ID 16406: The Security Account Database detected that the well known account UserName does not exist.
#Event ID 16407: The Security Account Database detected that the well known group or local group GroupName does not exist.
#Event ID 16408: Domain operation mode has been changed to Native Mode.
#Description
Domain operation mode has been changed to Native Mode. The change cannot be reversed.
Message #
Event ID 16409: Active Directory Domain Services failed to add a security principal to well known security principals container.
#Description
Active Directory Domain Services failed to add a security principal to well known security principals container. Please have an administrator add this security principal if needed. Security principal name: AccountName
Message #
Fields #
| Name | Description |
|---|---|
AccountName UnicodeString | |
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16410: Active Directory Domain Services failed to add all of the new security principals to well known security principals container.
#Event ID 16411: Active Directory Domain Services failed to rename a security principal in well known security principals container.
#Description
Active Directory Domain Services failed to rename a security principal in well known security principals container. Please have an administrator rename this security principal if needed. Security principal name: AccountName
Message #
Fields #
| Name | Description |
|---|---|
AccountName UnicodeString | |
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16412: Active Directory Domain Services failed to rename some of the security principals in well known security principals container.
#Event ID 16413: An error occurred when trying to remove the account Name from the group AccountName.
#Description
An error occurred when trying to remove the account Name from the group AccountName. The problem, "GroupName", occurred when trying to remove the account from the group. Please remove the member manually.
Message #
Fields #
| Name | Description |
|---|---|
AccountName UnicodeString | |
GroupName UnicodeString | |
ErrorString UnicodeString | |
__binLength | |
BinaryData |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE",
"event_source_name": "",
"event_id": 16413,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": 9223372036854775808,
"time_created": "2022-04-07T08:14:31.656794+00:00",
"event_record_id": 639,
"correlation": {},
"execution": {
"process_id": 648,
"thread_id": 652
},
"channel": "System",
"computer": "WIN-FPV0DSIC9O6.lab.local",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {
"Name": "SAMMSG_MEMBERSHIP_REMOVAL_SETUP_ERROR",
"AccountName": "Network Service",
"GroupName": "Performance Log Users",
"ErrorString": "The system cannot find the file specified.\r\n",
"Binary": "02000000"
},
"message": ""
}
References #
- Example event sourced from https://github.com/NextronSystems/evtx-baseline
Event ID 16640: The account-identifier allocator finished initializing.
#Event ID 16641: The account-identifier pool for this domain controller could not be updated.
#Message #
Event ID 16642: The account-identifier allocator was unable to assign a new identifier.
#Description
The account-identifier allocator was unable to assign a new identifier. The identifier pool for this domain controller may have been depleted. If this problem persists, restart the domain controller and view the initialization status of the allocator in the event log.
Message #
Fields #
| Name | Description |
|---|---|
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16643: An initial account-identifier pool has not yet been allocated to this domain controller.
#Description
An initial account-identifier pool has not yet been allocated to this domain controller. A possible reason for this is that the domain controller has been unable to contact the master domain controller, possibly due to connectivity or network problems. Account creation will fail on this domain controller until the pool is obtained.
Message #
Fields #
| Name | Description |
|---|---|
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16644: The maximum domain account identifier value has been reached.
#Event ID 16645: The maximum account identifier allocated to this domain controller has been assigned.
#Description
The maximum account identifier allocated to this domain controller has been assigned. The domain controller has failed to obtain a new identifier pool. A possible reason for this is that the domain controller has been unable to contact the master domain controller. Account creation on this controller will fail until a new pool has been allocated. There may be network or connectivity problems in the domain, or the master domain controller may be offline or missing from the domain. Verify that the master domain controller is running and connected to the domain.
Message #
Fields #
| Name | Description |
|---|---|
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16646: The computed account identifier is invalid because it is out of the range of the current account-identifier pool belonging to this domain controller.
#Description
The computed account identifier is invalid because it is out of the range of the current account-identifier pool belonging to this domain controller. The computed RID value is ComputedRIDValue. Try invalidating the account identifier pool owned by this domain controller. This will make the domain controller acquire a fresh account identifier pool.
Message #
Fields #
| Name | Description |
|---|---|
ComputedRIDValue UInt32 | |
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16647: The domain controller is starting a request for a new account-identifier pool.
#Description
The domain controller is starting a request for a new account-identifier pool.
Message #
Fields #
| Name | Description |
|---|---|
Name |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "{0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE}",
"event_source_name": "",
"event_id": 16647,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": -9223372036854775808,
"time_created": "2026-05-29T16:33:32.5431831+00:00",
"event_record_id": 6797,
"correlation": {},
"execution": {
"process_id": 812,
"thread_id": 1012
},
"channel": "System",
"computer": "telemetry-DC-a.cell-a.ludus.domain",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {},
"message": "The domain controller is starting a request for a new account-identifier pool."
}
Event ID 16648: The request for a new account-identifier pool has completed successfully.
#Description
The request for a new account-identifier pool has completed successfully.
Message #
Fields #
| Name | Description |
|---|---|
__binLength | |
ErrorCode |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "{0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE}",
"event_source_name": "",
"event_id": 16648,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": -9223372036854775808,
"time_created": "2026-05-29T16:33:33.6600056+00:00",
"event_record_id": 6798,
"correlation": {},
"execution": {
"process_id": 812,
"thread_id": 1012
},
"channel": "System",
"computer": "telemetry-DC-a.cell-a.ludus.domain",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {},
"message": "The request for a new account-identifier pool has completed successfully."
}
Event ID 16649: The account-identifier-manager object creation completed.
#Description
The account-identifier-manager object creation completed. If the record data for this event has the value zero, the manager object was created. Otherwise, the record data will contain the NT error code indicating the failure. The failure to create the object may be due to low system resources, insufficient memory, or disk space.
Message #
Fields #
| Name | Description |
|---|---|
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16651: The request for a new account-identifier pool failed.
#Event ID 16652: The domain controller is booting to directory services restore mode.
#Description
The domain controller is booting to directory services restore mode.
Message #
Event ID 16653: A pool size for account-identifiers (RIDs) that was configured by an Administrator is greater than the supported maximum.
#Description
A pool size for account-identifiers (RIDs) that was configured by an Administrator is greater than the supported maximum. The maximum value of Maximum will be used when the domain controller is the RID master. See http://go.microsoft.com/fwlink/?LinkId=225963 for more information.
Message #
Fields #
| Name | Description |
|---|---|
Maximum UInt32 |
Event ID 16654: A pool of account-identifiers (RIDs) has been invalidated.
#Description
A pool of account-identifiers (RIDs) has been invalidated. This may occur in the following expected cases.
Message #
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "{0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE}",
"event_source_name": "",
"event_id": 16654,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": -9223372036854775808,
"time_created": "2026-05-29T16:32:52.3615804+00:00",
"event_record_id": 6697,
"correlation": {
"ActivityID": "{C6821FB2-EF88-0001-1820-82C688EFDC01}"
},
"execution": {
"process_id": 812,
"thread_id": 816
},
"channel": "System",
"computer": "telemetry-DC-a.cell-a.ludus.domain",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {},
"message": "A pool of account-identifiers (RIDs) has been invalidated. This may occur in the following expected cases:\r\n1. A domain controller is restored from backup. \r\n2. A domain controller running on a virtual machine is restored from snapshot. \r\n3. An administrator has manually invalidated the pool. \r\nSee http://go.microsoft.com/fwlink/?LinkId=226247 for more information."
}
Event ID 16655: The global maximum for account-identifiers (RIDs) has been increased to NewValue.
#Event ID 16656: Action required!
#Description
Action required! An account-identifier (RID) pool was allocated to this domain controller. The pool value indicates this domain has consumed a considerable portion of the total available account-identifiers. A protection mechanism will be activated when the domain reaches the following threshold of total available account-identifiers remaining: CeilingTriggerRid. The protection mechanism prevents the allocation of account-identifier (RID) pools needed to allow existing DCs to create additional users, computers and groups, or promote new DCs into the domain. The mechanism will remain active until the Administrator manually re-enables account-identifier allocation on the RID master domain controller. See http://go.microsoft.com/fwlink/?LinkId=228610 for more information.
Message #
Fields #
| Name | Description |
|---|---|
CeilingTriggerRid UInt32 |
Event ID 16657: Action required!
#Description
Action required! This domain has consumed a considerable portion of the total available account-identifiers (RIDs). A protection mechanism has been activated because the total available account-identifiers remaining is approximately: CeilingTriggerRid. The protection mechanism prevents the allocation of account-identifier (RID) pools needed to allow existing DCs to create additional users, computers and groups, or promote new DCs into the domain. The mechanism will remain active until the Administrator manually re-enables account-identifier (RID) allocation on the RID master domain controller. It is extremely important that certain diagnostics be performed prior to re-enabling account creation to ensure this domain is not consuming account-identifiers at an abnormally high rate. Any issues identified should be resolved prior to re-enabling account creation. Failure to diagnose and fix any underlying issue causing an abnormally high rate of account-identifier consumption can lead to account-identifier (RID) pool exhaustion in the domain after which account creation will be permanently disabled in this domain. See http://go.microsoft.com/fwlink/?LinkId=228610 for more information.
Message #
Fields #
| Name | Description |
|---|---|
CeilingTriggerRid UInt32 |
Event ID 16658: This event is a periodic update on the remaining total quantity of available account-identifiers (RIDs).
#Event ID 16935: Failed to secure the machine account ComputerName.
#Event ID 16936: Failed to secure the machine account ComputerName.
#Description
Failed to secure the machine account ComputerName. This operation will be retried. Have an administrator verify the builtin\account operators full control Access Control Entry was removed from the security descriptor on this object.
Message #
Fields #
| Name | Description |
|---|---|
ComputerName UnicodeString | |
__binLength UInt32 | |
ErrorCode Binary |
Event ID 16937: Secured the machine account Name.
#Description
Secured the machine account Name. The builtin\account operators full control Access Control Entry was removed from the security descriptor on this object.
Message #
Fields #
| Name | Description |
|---|---|
ComputerName UnicodeString | |
__binLength | |
ErrorCode |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE",
"event_source_name": "",
"event_id": 16937,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": 9223372036854775808,
"time_created": "2022-04-07T08:14:31.637430+00:00",
"event_record_id": 624,
"correlation": {},
"execution": {
"process_id": 648,
"thread_id": 652
},
"channel": "System",
"computer": "WIN-FPV0DSIC9O6.lab.local",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {
"Name": "SAMMSG_MACHINE_ACCOUNT_SECURE",
"ComputerName": "",
"Binary": "00000000"
},
"message": ""
}
References #
- Example event sourced from https://github.com/NextronSystems/evtx-baseline
Event ID 16944: The certificate that is used for authentication does not have an issuance policy descriptor corresponding to OID OID in the Active Directory database.
#Description
The certificate that is used for authentication does not have an issuance policy descriptor corresponding to OID OID in the Active Directory database. This certificate will not be associated with a corresponding security identifier (SID), and the user may be denied access to some resources if you have resources whose access is restricted based on this issuance policy. The error is ErrorCode.
Message #
Fields #
| Name | Description |
|---|---|
OID UnicodeString | |
ErrorCode UInt32 |
Event ID 16945: The certificate issuance policy that is represented by OID OID Object DN does not have a link to a security identifier (SID), or this link cannot be read.
#Description
The certificate issuance policy that is represented by OID OIDObjectDN does not have a link to a security identifier (SID), or this link cannot be read. The link is represented by the attribute msDS-OIDToGroupLink on the msPKI-Enterprise-Oid object that represents the issuance policy. This certificate will not be associated with a corresponding SID, and the user may be denied access to some resources if you have resources whose access is restricted based on this issuance policy.
Message #
Fields #
| Name | Description |
|---|---|
OID UnicodeString | |
OIDObjectDN UnicodeString | |
ErrorCode UInt32 |
Event ID 16946: Multiple certificate issuance policy descriptors were found in the Active Directory database.
#Description
Multiple certificate issuance policy descriptors were found in the Active Directory database. The attribute msPKI-Cert-Template-OID of these descriptors contains string OID. This attribute should be able to uniquely identify an issuance policy descriptor; you should resolve this conflict. The issuance policies that are affected will not be associated with security identifiers (SIDs), and users who are authenticating using certificates that are issued by the corresponding policy may be denied access to some resources.
Message #
Fields #
| Name | Description |
|---|---|
OID UnicodeString |
Event ID 16947: The certificate issuance policy descriptor OID Object DN is linked through its attribute msDS-OIDToGroupLink to a group that is not a security group, has memb...
#Description
The certificate issuance policy descriptor OID Object DN is linked through its attribute msDS-OIDToGroupLink to a group that is not a security group, has members, or is not universal. The error is ErrorCode.
Message #
Fields #
| Name | Description |
|---|---|
OID UnicodeString | |
OIDObjectDN UnicodeString | |
GroupDN UnicodeString | |
GroupGUID UnicodeString | |
GroupSID UnicodeString | |
ErrorCode UInt32 |
Event ID 16948: The requested modification for group Group DN could not be performed.
#Description
The requested modification for group GroupDN could not be performed. This is because this group is linked through msDS-OIDToGroupLinkBl to a certificate issuance policy descriptor. Such groups should be security enabled, they should not have any members, and they should be universal. The requested operation was Operation. The error is ErrorCode.
Message #
Fields #
| Name | Description |
|---|---|
GroupDN UnicodeString | |
GroupGUID UnicodeString | |
GroupSID UnicodeString | |
Operation UnicodeString | Known values
|
ErrorCode UInt32 |
Event ID 16949: The certificate issuance policy descriptor OID Name cannot be linked to group Group Name.
#Description
The certificate issuance policy descriptor OIDName cannot be linked to group GroupName. Issuance policies can be linked through the attribute msDS-OIDToGroupLink only to universal, security-enabled groups that have an empty membership. You should ensure that this group meets these requirements. The error is ErrorCode.
Message #
Fields #
| Name | Description |
|---|---|
OIDName UnicodeString | |
GroupName UnicodeString | |
GroupGUID UnicodeString | |
GroupSID UnicodeString | |
ErrorCode UInt32 |
Event ID 16950: The following invalid claims issued to user User have been dropped: DroppedClaims.
#Event ID 16951: Claims issued to user User could not be validated and have been dropped.
#Event ID 16952: Claims issued to user User could not be validated and have been dropped.
#Event ID 16953: The password notification DLL NotificationPackage: failed to load with error Error code:.
#Description
The password notification DLL NotificationPackage failed to load with error Errorcode. Please verify that the notification DLL path defined in the registry, RegistrykeyRegistryvalue, refers to a correct and absolute path (<drive>:\<path>\<filename>.<ext>) and not a relative or invalid path. If the DLL path is correct, please validate that any supporting files are located in the same directory, and that the system account has read access to both the DLL path and any supporting files. Contact the provider of the notification DLL for additional support. Further details can be found on the web at http://go.microsoft.com/fwlink/?LinkId=245898.
Message #
Fields #
| Name | Description |
|---|---|
NotificationPackage UnicodeString | |
Registrykey UnicodeString | |
Registryvalue UnicodeString | |
Errorcode UInt32 |
Event ID 16960: SAM was configured to not listen on the TCP protocol.
#Description
SAM was configured to not listen on the TCP protocol.
Message #
Event ID 16961: Legacy password validation mode has been enabled on this machine.
#Description
Legacy password validation mode has been enabled on this machine. If an Exchange ActiveSync policy is configured it will not be enforced for password validation requests.
Message #
Event ID 16962: Remote calls to the SAM database are being restricted using the default security descriptor: Name.
#Description
Remote calls to the SAM database are being restricted using the default security descriptor: Name.
Message #
Fields #
| Name | Description |
|---|---|
Default SD String: | |
DefaultSDString |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "{0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE}",
"event_source_name": "",
"event_id": 16962,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": -9223372036854775808,
"time_created": "2026-05-29T16:32:50.8153223+00:00",
"event_record_id": 6693,
"correlation": {
"ActivityID": "{C6821FB2-EF88-0001-1820-82C688EFDC01}"
},
"execution": {
"process_id": 812,
"thread_id": 816
},
"channel": "System",
"computer": "telemetry-DC-a.cell-a.ludus.domain",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {
"Default SD String:": ""
},
"message": "Remote calls to the SAM database are being restricted using the default security descriptor: .\r\nFor more information please see http://go.microsoft.com/fwlink/?LinkId=787651."
}
Event ID 16963: Remote calls to the SAM database are being restricted using the configured registry security descriptor: RegistrySDString.
#Event ID 16964: The registry security descriptor is malformed: MalformedSDString.
#Event ID 16965: A remote call to the SAM database has been denied.
#Event ID 16966: Audit only mode is now enabled for remote calls to the SAM database.
#Description
Audit only mode is now enabled for remote calls to the SAM database. SAM will log an event for clients who would have been denied access in normal mode.
Message #
Event ID 16967: Audit only mode is now disabled for remote calls to the SAM database.
#Description
Audit only mode is now disabled for remote calls to the SAM database.
Message #
Event ID 16968: Audit only mode is currently enabled for remote calls to the SAM database.
#Event ID 16969: Suppressed Message Count: remote calls to the SAM database have been denied in the past Throttle window: seconds throttling window.
#Description
Suppressed Message Count: remote calls to the SAM database have been denied in the past Throttle window: seconds throttling window.
Message #
Fields #
| Name | Description |
|---|---|
Throttle window: | |
Suppressed Message Count: | |
Throttlewindow UInt32 | |
SuppressedMessageCount UInt32 |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "{0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE}",
"event_source_name": "",
"event_id": 16969,
"version": 0,
"level": 3,
"task": 0,
"opcode": 0,
"keywords": -9223372036854775808,
"time_created": "2026-03-18T03:17:55.2573947+00:00",
"event_record_id": 3119,
"correlation": {
"ActivityID": "{B96DB0BB-B639-0003-D1B0-6DB939B6DC01}"
},
"execution": {
"process_id": 1076,
"thread_id": 7912
},
"channel": "System",
"computer": "JD-WIN11-22H2-1.ludus.domain",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {
"Throttle window:": "900",
"Suppressed Message Count:": "1"
},
"message": "1 remote calls to the SAM database have been denied in the past 900 seconds throttling window.\r\nFor more information please see http://go.microsoft.com/fwlink/?LinkId=787651."
}
Event ID 16976: An error occurred while configuring one or more well-known accounts for this domain.
#Description
An error occurred while configuring one or more well-known accounts for this domain. This may be due to a transient error condition. The task will retry periodically until successful. For more information please see https://go.microsoft.com/fwlink/?linkid=832473. Status: Status
Message #
Fields #
| Name | Description |
|---|---|
Status HexInt32 | NTSTATUS reference |
Event ID 16977: The domain is configured with the following minimum password length-related settings.
#Description
The domain is configured with the following minimum password length-related settings.
Message #
Fields #
| Name | Description |
|---|---|
MinimumPasswordLength Int32 | |
RelaxMinimumPasswordLengthLimits Int32 | |
MinimumPasswordLengthAudit Int32 |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "{0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE}",
"event_source_name": "",
"event_id": 16977,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": -9223372036854775808,
"time_created": "2026-05-29T16:32:52.4237289+00:00",
"event_record_id": 6699,
"correlation": {},
"execution": {
"process_id": 812,
"thread_id": 816
},
"channel": "System",
"computer": "telemetry-DC-a.cell-a.ludus.domain",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {
"MinimumPasswordLength": "0",
"RelaxMinimumPasswordLengthLimits": "0",
"MinimumPasswordLengthAudit": "-1"
},
"message": "The domain is configured with the following minimum password length-related settings.\r\n\r\nMinimumPasswordLength: 0\r\n\r\nRelaxMinimumPasswordLengthLimits: 0\r\n\r\nMinimumPasswordLengthAudit: -1\r\n\r\nFor more information see https://go.microsoft.com/fwlink/?LinkId=2097191.\r\n"
}
Event ID 16978: The following account has been configured with a password whose length is shorter than the current MinimumPasswordLengthAudit setting.
#Event ID 16979: The domain is incorrectly configured with a MinimumPasswordLength setting that is greater than 14 while RelaxMinimumPasswordLengthLimits is either ...
#Event ID 16980: The security account manager has detected the use of a ROCA-vulnerable Windows Hello for Business key during authentication by the following account.
#Description
The security account manager has detected the use of a ROCA-vulnerable Windows Hello for Business key during authentication by the following account. The policy is currently configured for audit so the authentication was allowed to proceed. Account DN: AccountDN Account SID: AccountSID KeyHash: KeyHash For more information see https://go.microsoft.com/fwlink/?linkid=2116430.
Message #
Fields #
| Name | Description |
|---|---|
AccountDN UnicodeString | |
AccountSID UnicodeString | |
KeyHash UnicodeString |
Event ID 16981: The security account manager has detected and blocked the use of a ROCA-vulnerable Windows Hello for Business key during authentication by the foll...
#Event ID 16982: The security account manager is now logging verbose events for remote clients that call legacy password change or set RPC methods.
#Description
The security account manager is now logging verbose events for remote clients that call legacy password change or set RPC methods. This setting may cause large number of messages and should only be used for a short period time to diagnose problems. For more information please see https://go.microsoft.com/fwlink/?linkid=2150956.
Message #
Event ID 16983: The security account manager is now logging periodic summary events for remote clients that call legacy password change or set RPC methods.
#Description
The security account manager is now logging periodic summary events for remote clients that call legacy password change or set RPC methods.
Message #
Fields #
| Name | Description |
|---|---|
Name |
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "{0D4FDC09-8C27-494A-BDA0-505E4FD8ADAE}",
"event_source_name": "",
"event_id": 16983,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": -9223372036854775808,
"time_created": "2026-05-29T16:32:52.4237343+00:00",
"event_record_id": 6700,
"correlation": {},
"execution": {
"process_id": 812,
"thread_id": 816
},
"channel": "System",
"computer": "telemetry-DC-a.cell-a.ludus.domain",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {},
"message": "The security account manager is now logging periodic summary events for remote clients that call legacy password change or set RPC methods.\r\n\r\nFor more information please see https://go.microsoft.com/fwlink/?linkid=2150956.\r\n"
}
Event ID 16984: The security account manager detected Number of RPC methods: legacy password change or set RPC method calls in the past Throttle Window: minutes.
#Event ID 16985: The security account manager detected the use of a legacy password change or set RPC method from a network client.
#Event ID 16986: The security account manager has detected one or more duplicated names for a local account.
#Description
The security account manager has detected one or more duplicated names for a local account. This inconsistency was remediated by keeping one account name and deleting the remaining names.
Message #
Fields #
| Name | Description |
|---|---|
AccountRidHex HexInt32 | |
AccountRid Int32 | |
SavedAccountName UnicodeString | |
DeletedAccountNames UnicodeString |
Event ID 16987: The security account manager has detected one or more duplicated names for a local account.
#Description
The security account manager has detected one or more duplicated names for a local account. This inconsistency may cause application failures and\or system instability. No changes were made since the policy is in detect-only mode. Details: RID=AccountRidHex(AccountRid) Duplicate account names: DuplicatedAccountNames If the policy had been set to repair mode, the following account name would have been retained and all others deleted: Account name to retain: RetainedAccountName For more information see https://go.microsoft.com/fwlink/?linkid=2134956.
Message #
Fields #
| Name | Description |
|---|---|
AccountRidHex HexInt32 | |
AccountRid Int32 | |
DuplicatedAccountNames UnicodeString | |
RetainedAccountName UnicodeString |
Event ID 16988: The security account manager encountered one or more fatal errors on startup which will not allow the machine to start.
#Event ID 16989: The security account manager encountered one or more non-fatal errors on startup.
#Event ID 16990: The security account manager blocked a non-administrator from creating an Active Directory account in this domain with mismatched objectClass and u...
#Description
The security account manager blocked a non-administrator from creating an Active Directory account in this domain with mismatched objectClass and userAccountControl account type flags.
Message #
Fields #
| Name | Description |
|---|---|
Accountname UnicodeString | |
AccountobjectClass UnicodeString | |
userAccountcontrol UInt32 | |
Calleraddress UnicodeString | |
CallerSID UnicodeString |
Detection Patterns #
Credential Access: Kerberoasting
Event ID 16991: The security account manager blocked a non-administrator from creating or renaming a computer account using an invalid sAMAccountName.
#Description
The security account manager blocked a non-administrator from creating or renaming a computer account using an invalid sAMAccountName. sAMAccountName on computer accounts must end with a single trailing $ sign. Attempted sAMAccountName: SamAccountName Recommended sAMAccountName: SamAccountName$ For more information see https://go.microsoft.com/fwlink/?linkid=2173873.
Message #
Fields #
| Name | Description |
|---|---|
SamAccountName UnicodeString |
Detection Patterns #
Credential Access: Kerberoasting
Event ID 16992: The security account manager is now configuring the local password and lockout policies in accordance with regional policy.
#Description
The security account manager is now configuring the local password and lockout policies in accordance with regional policy.
Message #
Event ID 16993: The security account manager successfully initialized the Local Administrator Password Solution (LAPS) extension dll.
#Description
The security account manager successfully initialized the Local Administrator Password Solution (LAPS) extension dll.
Message #
Example Event #
{
"system": {
"provider": "Microsoft-Windows-Directory-Services-SAM",
"guid": "{0d4fdc09-8c27-494a-bda0-505e4fd8adae}",
"event_source_name": "",
"event_id": 16993,
"version": 0,
"level": 4,
"task": 0,
"opcode": 0,
"keywords": 9223372036854775808,
"time_created": "2026-05-08 00:27:36.762852+00:00",
"event_record_id": 973,
"correlation": {
"ActivityID": "{6ef2400c-de81-0003-2e40-f26e81dedc01}",
"RelatedActivityID": ""
},
"execution": {
"process_id": 988,
"thread_id": 992
},
"channel": "System",
"computer": "tel2-WIN11-25H2-1.ludus.domain",
"security": {
"user_id": "S-1-5-18"
}
},
"event_data": {},
"message": "The security account manager successfully initialized the Local Administrator Password Solution (LAPS) extension dll.\r\n"
}
Event ID 16994: The security account manager failed to initialize the Local Administrator Password Solution (LAPS) extension dll.
#Description
The security account manager failed to initialize the Local Administrator Password Solution (LAPS) extension dll.
Message #
Fields #
| Name | Description |
|---|---|
Status HexInt32 | NTSTATUS reference |
Event ID 16995: The security account manager is using the specified security descriptor for validation of computer account re-use attempts during domain join.
#Event ID 16996: The security descriptor that contains the computer account re-use allow list being used to validate client requests during domain join is malformed.
#Event ID 16997: The security account manager found a computer account that appears to be orphaned and does not have an existing owner.
#Event ID 16998: The security account manager rejected a client request to re-use a computer account during domain join.
#Provenance
Where this provider's schema came from, and which Windows build it was observed on. Windows can change a provider's event schema between builds, so use this to judge whether it matches the build you collect from.
ETW provider GUID 0d4fdc09-8c27-494a-bda0-505e4fd8adae
Defined in samsrv.dll, which carries the event manifest.
Observed on:
- WS2022-20348.4893, schema read from the registered manifest, binary version 10.0.20348.2849, captured 2026-06-02
- Win11-26200.6584, schema read from the registered manifest, binary version 10.0.26100.1882, captured 2026-06-02