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GetCallBackUrl is invalid on Azure
Working with the Azure DevFabric, the web role runs on port 82, but the request comes in on port 81.
GetCallBackUrl returns a URL for port 82 which then fails the IAuthenticationService.IsValid test.
Attached is an updated OpenIdController.cs with an updated GetCallBackUrl which works for both Azure and standard sites.
A similar issue may occur on a site using port forwarding in a router. This should fix that issue as well.