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401.1 Unauthorized - IIS & WCF using custom host headers and host entry

Published 5 May 10 11:55 AM | Blog

I ran into a bit of a issue today at a client with Windows Authentication and WCF services (it seems like a very common problem) where I was using a host header in IIS to test a web application I was working on. To do this, I added an entry to the hosts file in %windir%\system32\drivers\etc to map the custom host name (e.g. testapp.com) to 127.0.0.1 Accessing the web application worked fine, but trying to access the WCF services hosted under IIS (also using Windows Authentication) kept prompting...

Filed under: Development, WCF, Loopback, hosts, 401, IIS