0x800f0922 Update IIS-RequestMonitor failed

[IIS]

Several features such as WebSocket Protocol, Tracing or Request Monitor can be installed in IIS server on need basis.



I came across to the error message below in Event Viewer while trying to install Request Monitor in Windows Server 2016



Update IIS-RequestMonitor of package IIS-WebServer-Core-Package failed. Status: 0x800f0922









Server Manager displayed this error:



The request to add or remove features on the specified server failed. Error: 0x800f0922





We also tried installation it via PowerShell. Here is the result:



Enable-WindowsOptionalFeature: Enable-WindowsOptionalFeature failed. Error code = 0x800f0922







Troubleshooting


Collect and analyze the following logs:

• CBS logs (C:\Windows\Logs\CBS)
• DISM logs (C:\Windows\Logs\DISM)
• ApplicationHost.config file (C:\Windows\System32\inetsrv\config)
• The output of Dism /Online /Cleanup-Image /ScanHealth command
• Procmon logs (Use Process Monitor tool)

Following questions also help narrowing the issue down:

• Are you able to install Request Monitor by logging in with another user?
• Are you able to install Request Monitor in another server?
• Are there other roles apart from IIS installed in the server?
• Make sure there is enough space in the disks (Right click on Start menu icon > Computer Management > Disk Management)
• If not installed yet, install .NET Framework and try again

In my case, Procmon logs showed PARSE_ERROR_INFO while reading applicationHost.config file which points out an issue with this file.



641 2:08:09.7690809 PM appcmd.exe 10992 1052 ReadFile C:\Windows\System32\inetsrv\config\applicationHost.config SUCCESS Offset: 0, Length: 63,692, Priority: Normal
8 KernelBase.dll ReadFile + 0x74
9 nativerd.dll CONFIG_XML_DOM:arseXmlFile + 0xac
10 nativerd.dll CONFIG_FILE:arseConfigFile + 0x148
642 2:08:09.7692157 PM appcmd.exe 10992 1052 CreateFile C:\Windows\System32\inetsrv\en-US\iisres.dll.mui SUCCESS Desired Access: Generic Read, Disposition: Open, Options: , Attributes: n/a, ShareMode: Read, Delete, AllocationSize: n/a, OpenResult: Opened
17 nativerd.dll AdminFormatMessage + 0x4c
18 nativerd.dll PARSE_ERROR_INFO::SetErrorInfo + 0x2d





Solution


As the Procmon point out a parsing issue with applicationHost.config file, we tried to open this file. As expected, it was corrupted:



We didn’t have a backup of this file so we had to reinstall IIS. This fixed the issue.

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