When I have started too many virtual machines in Microsoft Virtual Server 2005 I find that the administration application (http://server/virtualserver/VSWebApp.exe) stops working.
To get it to restart, change the authentication settings on the IIS virtual directory to something other than what you have already (but not anonomyous). For example if it is Basic and Integrated set it to Basic only.
Open the admin page again and you will be prompted for authentication and it will now work.
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