asp.net iis server red asterisk page validation

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http://serverfault.com – I'm getting a strange error with my ASP.NET website. I'm developping with C#, Asp.Net and Visual Studio. When developping and starting my website with Visual Studio (Ctrl+F5), VS starts its own web server and everything is fine. Now I'm deploying a web server on a Windows Server 2008 R2 server. I've installed my IIS Server, copied my website and the website is starting properly ! My problem : When trying to log on my website, all my required fields get a red asterisk beside them even tho I enter correct values in them ! Must be some kind of configuration problem on this server but I can't (HowTos)