Microsoft-Windows-MosHost

Event	Title	Channel	Sample	Rule
1	String1.	Operational	N	N
2	String1 String2.	Operational	N	N
3	Message Error: ErrorCode.	Operational	N	N
10	Framework State: Framework_State, HRESULT: HRESULT.	Operational	N	N
20	MosHost ServiceStart	Operational	N	N
21	MosHost ServiceStop	Operational	N	N
30	MosHost IncrementClientCount	Operational	N	N
31	MosHost DecrementClientCount	Operational	N	N
50	MosHost ExecCommand	Operational	N	N
70	MosHost GetDataDirectory	Operational	N	N
80	MosHost GetResourceDirectory	Operational	N	N
90	MosHost GetBrowseCacheSizeInMBytes	Operational	N	N
100	MosHost RegisterClient	Operational	N	N
101	MosHost RegisterClient PID: MosHost_RegisterClient_PID Type: Type.	Operational	N	N
110	MosHost DeregisterClient	Operational	N	N
111	MosHost DeregisterClient PID: MosHost_DeregisterClient_PID Type: Type.	Operational	N	N
120	MosHost GetActiveClients	Operational	N	N
121	MosHost GetActiveClients Total: MosHost_GetActiveClients_Total Unique: Unique.	Operational	N	N
130	MosHost GetReadSharingToken	Operational	N	N
131	MosHost GetReadSharingToken Info Path: MosHost_GetReadSharingToken_Info_Path …	Operational	N	N
150	MosHost150	Operational	N	N
151	MosHost151	Operational	N	N
152	MosHost ConnectivityCallback Online: MosHost_ConnectivityCallback_Online.	Operational	N	N
153	MosHost SetMosOnline Online: MosHost_SetMosOnline_Online.	Operational	N	N
1000	Odml IncrementOdmlClientCount	Operational	N	N
1001	Odml DecrementOdmlClientCount	Operational	N	N
1010	Odml StartInstallation Start	Performance	N	N
1011	Odml StartInstallation Stop	Performance	N	N

Event ID 1: String1.

Channel: Operational
Task: MosHost

Message #

%1

Fields #

Name	Description
`String1` UnicodeString

Event ID 2: String1 String2.

Channel: Operational
Task: MosHost

Message #

%1 %2

Fields #

Name	Description
`String1` UnicodeString
`String2` UnicodeString

Event ID 3: Message Error: ErrorCode.

Channel: Operational
Task: MosHost

Message #

%1 Error: %2

Fields #

Name	Description
`Message` UnicodeString
`ErrorCode` UInt32

Event ID 10: Framework State: Framework_State, HRESULT: HRESULT.

Channel: Operational
Task: MosHost

Message #

Framework State: %2, HRESULT: %1

Fields #

Name	Description
`HRESULT` UInt32
`State` UInt32

Event ID 20: MosHost ServiceStart

Channel: Operational
Task: MosHost

Event ID 21: MosHost ServiceStop

Channel: Operational
Task: MosHost

Event ID 30: MosHost IncrementClientCount

Channel: Operational
Task: MosHost

Event ID 31: MosHost DecrementClientCount

Channel: Operational
Task: MosHost

Event ID 50: MosHost ExecCommand

Channel: Operational
Task: MosHost

Event ID 70: MosHost GetDataDirectory

Channel: Operational
Task: MosHost

Event ID 80: MosHost GetResourceDirectory

Channel: Operational
Task: MosHost

Event ID 90: MosHost GetBrowseCacheSizeInMBytes

Channel: Operational
Task: MosHost

Event ID 100: MosHost RegisterClient

Channel: Operational
Task: MosHost

Event ID 101: MosHost RegisterClient PID: MosHost_RegisterClient_PID Type: Type.

Channel: Operational
Task: MosHost

Message #

MosHost RegisterClient PID: %1 Type: %2

Fields #

Name	Description
`Dword1` UInt32
`Dword2` UInt32

Event ID 110: MosHost DeregisterClient

Channel: Operational
Task: MosHost

Event ID 111: MosHost DeregisterClient PID: MosHost_DeregisterClient_PID Type: Type.

Channel: Operational
Task: MosHost

Message #

MosHost DeregisterClient PID: %1 Type: %2

Fields #

Name	Description
`Dword1` UInt32
`Dword2` UInt32

Event ID 120: MosHost GetActiveClients

Channel: Operational
Task: MosHost

Event ID 121: MosHost GetActiveClients Total: MosHost_GetActiveClients_Total Unique: Unique.

Channel: Operational
Task: MosHost

Message #

MosHost GetActiveClients Total: %1 Unique: %2

Fields #

Name	Description
`Dword1` UInt32
`Dword2` UInt32

Event ID 130: MosHost GetReadSharingToken

Channel: Operational
Task: MosHost

Event ID 131: MosHost GetReadSharingToken Info Path: MosHost_GetReadSharingToken_Info_Path Token: Token.

Channel: Operational
Task: MosHost

Message #

MosHost GetReadSharingToken Info Path: %1 Token: %2

Fields #

Name	Description
`String1` UnicodeString
`String2` UnicodeString

Event ID 150: MosHost150

Channel: Operational
Task: MosHost

Event ID 151: MosHost151

Channel: Operational
Task: MosHost

Event ID 152: MosHost ConnectivityCallback Online: MosHost_ConnectivityCallback_Online.

Channel: Operational
Task: MosHost

Message #

MosHost ConnectivityCallback Online: %1

Fields #

Name	Description
`Dword1` UInt32

Event ID 153: MosHost SetMosOnline Online: MosHost_SetMosOnline_Online.

Channel: Operational
Task: MosHost

Message #

MosHost SetMosOnline Online: %1

Fields #

Name	Description
`Dword1` UInt32

Event ID 1000: Odml IncrementOdmlClientCount

Channel: Operational
Task: Odml

Event ID 1001: Odml DecrementOdmlClientCount

Channel: Operational
Task: Odml

Event ID 1010: Odml StartInstallation Start

Channel: Performance
Task: Odml
Opcode: Start

Event ID 1011: Odml StartInstallation Stop

Channel: Performance
Task: Odml
Opcode: Stop

Provenance

ETW provider GUID d116f0f2-a6d6-4f1f-bdda-0c88c8d1f2e9

Defined in Microsoft-Windows-MosHost.dll, which carries the event manifest.

Win11-26200.6584, schema read from the registered manifest, binary version 10.0.26100.1882, captured 2026-06-02 — Manifest XML pack, 2.0 MB