Configuration :: Debugging Internal Server Error After .net 4 Upgrade?

Jun 7, 2010

I've got two sites hosted on a win2008R2 box that I just moved to .net 4 from 3.5. One worked well, but the other is showing a 500-internal server error on the server. It builds fine in VS, and runs fine in Cassini.I've changed the app pool to .net 4 and copied the new web config into the site, but I still get an error. I did this about a month ago with another site and everything worked fine.I can't use my own error logging code because my app doesn't even get started, and IIS doesn't seem to leave anything in the application event log. Apologies in advance for a dumb question, but where can I get some more detail on this error?500 - Internal server error.There is a problem with the resource you are looking for, and it cannot be displayed.

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Apr 20, 2010

I am currently trying to setup our website on a windows 2008 R2 64bit machine without much success. When I try to run the website I get the error detailed below. This only happens when I run the site under .NET 4. It works when I run it under .NET 2.

I have also tried going to a test aspx page to see what happens and it also give me the same error so it is obviously something to do with .NET 4 or the way I have it set up. I am thinking it might be a permissions thing but I am not sure what permissions should be set where. Please note this is the full version of .NET 4. The error I keep getting is:

HTTP Error 500.0 - Internal Server Error

An error message detailing the cause of this specific request failure can be found in the application event log of the web server. Please review this log entry to discover what caused this error to occur.Detailed Error Information

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the same application is working fine in 32 bit machine of my colleague where as in my  64 bit machine I am getting the following error. I also tried by changing Target Platform of the web app, under Properties-->Build-->Platform Target: From X86 to X64, in fact I tried all 3.

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[Code]....

Config Source:

18:     <validation validateIntegratedModeConfiguration="false"/>  
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