http://blogs.msdn.com/b/charles_sterling/archive/2007/01/08/wcf-clients-generated-with-svcutil-exe-failing-with-error-securitynegotiationexception.aspxI have been having challenges creating Windows Communication Foundation (WFC) Clients on my Windows Vista computer using Svcutil.exe and just found the cause: It was due to the identity tag the SVCUTIL utility is adding to the clients app.config. Removingen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/charles_sterling/archive/2007/01/08/wcf-clients-generated-with-svcutil-exe-failing-with-error-securitynegotiationexception.aspx#4733055Tue, 04 Sep 2007 05:40:24 GMT91d46819-8472-40ad-a661-2c78acb4018c:4733055Getting the name of the user account that is calling a WCF service operation « Glue and Sticky Tape<p>PingBack from <a rel="nofollow" target="_new" href="http://glueandstickytape.wordpress.com/2007/09/04/getting-the-name-of-the-user-account-that-is-calling-a-wcf-service-operation/">http://glueandstickytape.wordpress.com/2007/09/04/getting-the-name-of-the-user-account-that-is-calling-a-wcf-service-operation/</a></p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=4733055" width="1" height="1">