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WCF Client Inner Exception: "The Security Support Provider Interface (SSPI) negotiation failed."

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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:

<identity>
<userPrincipalName value="MYDOMAIN\MyUsername" />
</identity>

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

Let me know if this helped you!

Comments

  • Anonymous
    April 04, 2011
    Thanks it helped a lot, after searching for an hour

  • Anonymous
    September 26, 2011
    yes same error and it helped

  • Anonymous
    December 20, 2011
    Thanks.

  • Anonymous
    January 10, 2012
    Thank you vary much!!!

  • Anonymous
    March 04, 2012
    Well it did the trick... not sure how and why. But thanks!

  • Anonymous
    June 21, 2012
    Cool thanks, helped a lot :-)

  • Anonymous
    July 04, 2012
    Thank you very much. It helped.

  • Anonymous
    July 10, 2012
    Yes, great... Thanks. Do you have more details explanation about this problem?

  • Anonymous
    July 25, 2012
    Yes.  You want to run in the context of the service not a particular user.

  • Anonymous
    November 15, 2012
    You bet it did and saved me a lot of time. Thank you so much :)

  • Anonymous
    March 02, 2013
    Thanks! It helped :)

  • Anonymous
    May 28, 2013
    Thank you! I didn't even see those 3 lines.

  • Anonymous
    June 06, 2013
    Thanks.. it really saved lot of time

  • Anonymous
    August 06, 2013
    Thanks, its my issue as well :-)

  • Anonymous
    August 10, 2013
    you have saved my time man.. Thanks

  • Anonymous
    October 02, 2013
    It worked like a charm after the alteration you suggested. Thanks buddy!

  • Anonymous
    March 06, 2014
    Thanks that got my test application working but I was determined to make it work with those three lines left in. So this is what I did (on Windows 7 Pro logged on as a domain user));

  1. I needed to find out what my User Principal Name (UPN) was. A bit of Googling gave me this gem. Open a cmd prompt and run; whoami /upn This gave me; fred.bloggs@xyz.com

  2. But I'd also read that I needed to prefix this with my domain name. I ran whoami again without the /upn switch; That gave me xyzfred.bloggs, so my domain is xyz. So putting it all together; <identity>     <userPrincipalName value="xyzfred.bloggs@xyz.com /> </identity> It works!! Hope that helps someone out :)

    • Anonymous
      March 14, 2018
      Hmm. Doesn't work for me. :-(

  • Anonymous
    April 21, 2014
    Thanks Fred. It worked for me :)

  • Anonymous
    May 05, 2014
    Great!!! It works!! Thank you..

  • Anonymous
    January 20, 2015
    thanks alot

  • Anonymous
    April 19, 2017
    Simple trick saved my time :)Thanks for the post

  • Anonymous
    March 14, 2018
    Thank you for posting this. It worked for me and reduced my blood pressure! There are several bugs in the MS tutorial on WCF and failing to mention this is one of them. I followed the tutorial using VS 2017 15/6/1, Framework 4.7.02556.As Hendra Pratama says: do you or anyone else have any more details about this?