So here is the error that I am trying to help a friend with (I don't think I would have tried this). He has a legacy Asp.net 1.1 application. He has already added some ASP.NET 2.0 features to his application. His app is running on a Windows 2003 server. He has the main application running in a 1.1 app pool. In one of the sub folders is where all of the .Net 2.0 features are living so he has added a second web application to IIS that points to the sub folder and put this app in a 2.0 app pool. His application runs well most of the time but intermittently users are getting a "White screen" and the whole application is going down(He is 95% sure that it is the 1.1 app pool that is going down). How can he fix his problem?
+1
A:
Take a look in the Application and System event logs on the server. You should the W3SVC crashing and a reason why. Double and triple-check that no app pool contains applications which run both runtimes. Also, you can only run ASP.NET 1.1 and 2.0 in parallel on IIS if it's running in 32-bit mode, because .NET 1.1 is 32-bit only.
Dave Markle
2009-06-03 23:20:12