Tuesday, October 19, 2010

TFS 2010 Excel Report Dashboards Error: "Unexpected callback response! 400 Bad Request

Recently while migrating some Team Portals to a new Sharepoint Server, I started receiving the following error when accessing the excel report dashboards:

"Unexpected callback response! 400 Bad Request
Bad Request - Request too long"

There is a blog post by Grant Holiday http://blogs.msdn.com/b/granth/archive/2010/08/13/sharepoint-2010-error-http-error-400-the-size-of-the-request-headers-is-too-long.aspx that describes the error.

The original cause for the error is linked from his blog and it is somewhat of a mind stretch to understand. But from a practical point, the error was occurring due to a difference in setup between our old sharepoint server and the new one. The old server was using NTLM and the new one had been configured for kerberos.

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