Search Query Web Service returns "Attempted to perform an unauthorized operation"

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

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