Check this article on MSDN: http://msdn.microsoft.com/en-us/library/ms972976.aspx My guess is that you need to make sure the machine key is the same on the proxy server as on your web application server.
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Check this article on MSDN: http://msdn.microsoft.com/en-us/library/ms972976.aspx My guess is that you need to make sure the machine key is the same on the proxy server as on your web application server.