Confused regarding WCF identity dns value

I'm confused about what the identity element on a client endpoint really does. I've understood that a identity dns value like is supposed to tell WCF to assert that the service's certificate is issued to myserver.local. And that this should allow me to开发者_Python百科 point the endpoint address to https://localhost/MyService.svc instead of https://myserver.local/MyService.svc.

But this fails I don't understand why. I have myserver.local pointing to 127.0.0.1 in my host file and I have self-created certificate issued to myserver.local. It works fine with myserver.local but when I change the endpoint address to localhost it stops working because it "can't establish a SSL/TLS trust".

Can anyone explain why?

Thanks

If you want to know what the WCF Identity DNS value is for, and what to put in it, see this question:

WCF client endpoint identity - configuration question

It helped me to understand what it's for.