.NET 4.0 AppPool and a 503 Service Unavailable

Thursday, 17 December 2009 05:04 AM
by Coose

We like to stay ahead of the game and get the newest stuff on the .NET platform when we can.  Since VS2010 and .NET 4.0 Beta 2 came out recently, we are in the process of migrating to it.  When trying to use an ASP.NET AppPool with the 4.0 Beta 2 framework (4.0.21006), I could get nothing but a “503 Service Unavailable” on any web site using that AppPool.

Long story short: Some of the framework Beta 1 components still existed in the framework directory (c:\windows\microsoft.net\framework\v4.0.21006).  Delete that folder, restart the AppPool, and all is well.

Does it surprise anyone else that Microsoft’s Beta Uninstaller didn’t do a complete job of uninstallation?

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