SharePoint 2010 Search Issue after Claim based Authentication-FBA

Getting following error and search is not working after claim based authentication.

found error in event viewer about claim based authentication.

Request for security token failed with exception: System.ServiceModel.Security.MessageSecurityException: The HTTP request is unauthorized with client authentication scheme 'Negotiate'. The authentication header received from the server was ''. ---> System.Net.WebException: The remote server returned an error: (401) Unauthorized.    

Thanks,

Deepak