I've been developing an application using Visual Studio 2010. I've been using FireFox 24.0 as my browser running VS's IIS dev server. It was running fine before a company policy procedure meant I had to change my computer name. After restarting, I get an error 403 Server Error in '/' Application. I first checked my IIS settings and made sure the service was running. When that didn't help, I chose another browser by default. The application ran as normal which points to some security setting on FF. I cleared the cache and cookies and other things but nothing I've tried works.