I have a WCF REST service that needs to communicate with another WCF REST service.

There are three websites:

• Default Web Site
• Website1
• Website2

If I set up both services in Default Web Site and connect to the other (using HttpClient) using the URI http://localhost/service then everything is okay.

The desired set-up is to move these two services to separate websites and rather than using the URI http://localhost/service, accessing the service via http://website1.domain.com/service still using HttpClient.

I received the exception:

System.ArgumentOutOfRangeException: Unauthorized (401) is not one of the following: OK (200), Created (201), Accepted (202), NonAuthoritativeInformation (203), NoContent (204), ResetContent (205), PartialContent (206)

I can see this is a 401, but what is going on here?

Thanks