Security :: Forms Authentication Failed "The Ticket Supplied Was Invalid" For Users Using A Proxy?

May 11, 2010

Since we updated our website to .NET 4.0, users using a proxy-server can't login in our webapplication anymore.In the event-viewer on the server this error is thrown:Forms authentication failed for the request. Reason: The ticket supplied was invalid.This problem only exists for users with a proxy, all other users can login normally.We are not using a web garden or multiserver (load balance) environment, just a webserver and a databaseserver.

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