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Ok, now i know whats breaking the site. The site have en empty folder with the same name as the webUI, and this folder is used to limit access to the UI from external IP-addresses using "Domain and IP-filter" in IIS. If i rename the folder, the dashboard works.
Guess i'll just have to use another method to limit access....
I noticed a problem on one of our sites. After changing to .NET4, the Dashboard reports error 404. The configuration is exactly the same as for other servers... So i'm kinda guess the server miss the correct MVC? What version should it be? Any other ideas?