Just wasted a bunch of time looking at a problem which, initially pointed at a permissions problem in our good old friend IIS7…
The error we got was a 500.19 error with the message:
The requested page cannot be accessed because the related configuration data for the page is invalid.
Well that’s a red herring. It turned out we had a Virtual Directory set up with the same name as an MVC controller – removing that sorted everything out!
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