Event ID - 9001

Event Id9001
DescriptionThe Application Host Helper Service encountered an error while adding the mapping for the application pool name '%1' to its SID. That particular SID is already mapped to another application pool name, causing a conflict. To resolve this issue, please change the name of this application pool. The data field contains the error number.
Event Information According to Microsoft :
Resolution :
Change an IIS application pool name
To perform this procedure, you must have membership in Administrators , or you must have been delegated the appropriate authority.
To change the application pool name:
1.Click Start , click Control Panel , and then click Administrative Tools .
2. Right-click Internet Information Services (IIS) Manager and select Run as administrator .
3.In the Connections pane, expand the server node and click Application Pools .
4. On the Application Pools page, select the application pool you want to rename.
5.In the Actions pane, under Edit Application Pool , click Rename , type the new name in the rename text box, and then press ENTER or click outside the rename text box.
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 9001 from Source Microsoft-Windows-IIS-APPHOSTSVC

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