An unhandled exception occurred in the user interface.Exception Information. The request failed with HTTP status 401:Unauthorized

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 Symptoms:

When you click on the search settings page on the SSP, you get the following error message :The search service is currently offline. Visit the services on server page in SharePoint central administration to verify whether the service is enabled. This might also be because an indexer move is in progress and

when you click on the "Office SharePoint Server Search Service", you get the following error message : An unhandled exception occurred in the user interface.Exception Information. The request failed with HTTP status 401:Unauthorized

Cause:

Incorrect Kerberos Setup or Inconsistent Patch level of sharepoint.

Resolution:

Disable Kerberos in the "Office Server Web Services" web site using :  cscript adsutil.vbs set w3svc/<ID of "Office Server Web  Services">/root/NTAuthenticationProviders "NTLM"

OR

Run the following command on all the SharePoint server : stsadm -o SetSharedWebServiceAuthn -ntlm