Regenerate WCF Configuration Error - A Call to SSPI failed, see inner exception

Hi, 

I faced this error when I clicked "Refresh Configuration" at Dynamics AX Configuration Utility. 

Error Title: Regenerate WCF Configuration

Error Message: 

An error occured while regenerating WCF configuration:

Exception occured on the metadata service on client or server. See exception details below:

>A call to SSPI failed, see inner exception.

p/s: actually i need to refresh configuration because I faced error at Visual Studio 2010 when i try to load a list of queries from Dynamics AX.

Please help.