Event ID - 9000

Event Id9000
DescriptionThe Application Host Helper Service encountered an error while reading the data for SID mapping. Please ensure that the application pool name data is correct in the configuration file. To resolve this issue, please recommit the changes or restart this service. The data field contains the error number.
Event Information According to Microsoft :
Resolution :
Reapply changes and restart AppHostSvc
When configuration changes do not appear to take effect, possible resolutions include the following:
1.Reapply the changes.
2. Reduce the number of application pools.
3. Stop and restart the Application Host Helper Service (AppHostSvc).
Stop and restart the Application Host Helper Service
To perform this procedure, you must have membership in Administrators , or you must have been delegated the appropriate authority.
To stop and restart the Application Host Helper Service:
1.Open an elevated Command Prompt window. Click Start , point to All Programs , click Accessories , right-click Command Prompt , and then click Run as administrator.
2.At the command prompt, type net stop apphostsvc .
3. At the command prompt, type net start apphostsvc.
Verify :
If Application Host SID Mapping is not configured correctly, Web sites in the affected application pool will fail to serve pages. For this reason, you can verify the Application Host SID Mapping functionality by performing a test browse.
To perform a test browse:
1.Choose a Web site or an application that is configured to run in the application pool that you want to verify.
2.Open up your default browser or required client.
3.Browse to a page in the Web site or application that you chose in step 1.
4. The client should display the expected output page. If Application Host SID Mapping is configured correctly, the page will be displayed.
Reference LinksEvent ID 9000 from Source Microsoft-Windows-IIS-APPHOSTSVC

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