No logs, no details, no events, nothing besides opaque 500 error

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http://serverfault.com – I have an IIS 7.5 web site that is giving this error: There is a problem with the resource you are looking for, and it cannot be displayed. Yesterday, this site worked fine. Today, it declines to work. The web site points to an ASP.NET 4.0 app. The app's application pool has normal settings: (Don't mind the app pool name; it's only being used for this one web server.) This is just one of several ASP.NET 4.0 web sites on a Windows 2008 R2 server. The other web sites work fine; this is the only broken one. Here's what's odd: No events in the Windows Application or System even logs Chan (HowTos)