You might have come across to the following “HTTP Error 500.0 - Internal Server Error” while working on Windows Vista. 

HTTP Error 500.0 - Internal Server Error

Follow the directions shown on the error message to resolve the problem:

You can migrate the application configuration, including the contents of the configuration section, by using the following from a command line window (the window must be running as Administrator):

%systemroot%\system32\inetsrv\APPCMD.EXE migrate config "bloggingdeveloper/"

1) Migrate the application to work with the Integrated .NET mode (PREFERRED).

You can migrate the application configuration, including the contents of the configuration section, by using the following from a command line window (the window must be running as Administrator):

%systemroot%\system32\inetsrv\APPCMD.EXE migrate config "bloggingdeveloper/"

After you migrate your application, it will run in both Classic and Integrated .NET modes, as well as on downlevel platforms.

2) Move this application to an application pool using the Classic .NET mode.

You can move the application to the default application pool using the Classic .NET mode by running the following from an command line window (the window must be running as Administrator):

%systemroot%\system32\inetsrv\APPCMD.EXE set app "bloggingdeveloper/" /applicationPool:"Classic .NET AppPool"

Alternatively, you can use any other application pool on your system that is running in the Classic .NET mode. You can also use the IIS Administration tool to move this application to another application pool.

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