Parent Child Named Pipe WCF service within the same process issue

I'm having a strange issue when开发者_运维百科 I host two named pipe WCF services within the same process with one communicating with the other. One of the services is a parent singleton that holds a proxy to multiple child persession instances. I'm hosting them both on process startup using named pipe end points. Everything works fine but when I enabled impersonation on both of the services I get an endpoint not found exception in the parent to child proxy creation. Any idea why impersonation would be causing this to fail?