To troubleshoot your issue with delegating control in Active Directory:

1. Check the IIS web server’s configuration to see if Active Directory delegation is enabled.
2. Verify the user has credentials for the domain in which Active Directory resides.
3. Check the security role related to Active Directory to ensure the user has access to the required permissions.
4. Check that the user has sufficient rights to the Active Directory server and the domain controller.
5. Check if the application pool has proper user credentials available for Active Directory.
6. Review any relevant firewall settings.