return url on iis website

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http://serverfault.com – We have a production environment and an UAT environment, the authentication settings on both the servers are the same. Now, when I deploy the application onto the production the application is logging me out with ReturnUrl. We are using following authentication settings on the servers. Web Server (Web application is hosted):- Anonymous Authentication Forms Authentication Web Server (Web service is hosted):- Anonymous Authentication The application is using .net framework 3.5 It's running on Windows 2008 R2 Any starting point to investigating as to what is the thing that is causing the dif (HowTos)