Recently while using search service in MOSS 2007 I got this error System.Web.Services.Protocols.SoapException: Server was unable to process request. —> Attempted to perform an unauthorized operation. Solution:
- Check if the current user has appropriate permissions on SharePoint site.
- The Web Application should be configured configured with Integrated Windows Authentication and anonymous access should be disabled/unchecked.
Go to IIS—>Website—>Properties—>Directory Security—>Uncheck Enable Anonymous Access