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Error: No OpenID endpoint found, when your server exists behind a proxy server such as TMG server

If your STS server exists behind a proxy server such as TMG server and you got "Error: No OpenID endpoint found" when trying to sign-in with an OpenID provider, you need to specify your proxy server address in your STS web.cofing.

Note: if you just using Windows Live ID, you don't need to follow this instruction, Windows Live ID has another mechanism and should works on any proxy and firewall servers.

Instruction

Open web.config of your STS site and find <system.net> tag, and add your proxy server address such as following sample:

<configuration>
.
.
.
<system.net>
    <defaultProxy>
       <proxy usesystemdefault="true" proxyaddress="http://YourProxySever:Port" bypassonlocal="true" /> 
    </defaultProxy>
  </system.net>
</configuration>
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