Event ID - 9004

Event Id9004
SourceMicrosoft-Windows-IIS-APPHOSTSVC
DescriptionThe Application Host Helper Service encountered an error while adding multiple mappings for application pool names to their SIDs. To resolve this issue, please recommit the changes and restart the service. The data field contains the error number.
Event Information According to Microsoft :

Cause :

This event is logged when the Application Host Helper Service encountered an error while adding multiple mappings for application pool names to their SIDs.

Resolution :

Reapply changes and restart AppHostSvc

When configuration changes do not appear to take effect, possible resolutions include the following:
  • Reapply the changes.
  • Reduce the number of application pools.
  • 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 9004 from Source Microsoft-Windows-IIS-APPHOSTSVC

Catch threats immediately

We work side-by-side with you to rapidly detect cyberthreats
and thwart attacks before they cause damage.

See what we caught

Did this information help you to resolve the problem?

Yes: My problem was resolved.
No: The information was not helpful / Partially helpful.
 Refresh