How do I set the user principal name that the client will use
when calling the service?  The user principal name can be set
through either code or configuration, and it's considered a part
of the endpoint address used by the client. That means that
physically you'll find the user principal name and the
description of the endpoint collocated.  In configuration that
looks like:  <endpoint address="..." binding="..."
bindingConfiguration="..." contract="..." name="...">
<userPrincipalName value="" />  And, in code that looks like:
EndpointAddress address = new EndpointAddress(  Next time:
Differences Between WSDL and XSD