Jeff Sanders Technical Blog

I am a Microsoft employee that has worked on all aspects of the Web Stack for a long time. I hope these blogs are useful to you! Use this information at your own risk.

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Wcf Client Inner Exception The Security Support Provider Interface Sspi Negotiation Failed

- 14 Oct 2010

Creating a WCF Client in Visual Studio 2010, I struggled with this error.  I was running as the currently logged on user and the service was as well so this made no sense to me.  I found that this entry in the client app.config was the culprit:

<userPrincipalName value=”MYDOMAIN\MyUsername” />

Simply deleting these 3 lines allowed me to test the client.

Let me know if this helped you! </p>

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