Decoding error 500 on IIS7

I am getting error 500, looking at the log I can see the http headers with the error 500, but how do I find out why it's happening? Is there any other tool I should be looking at? The开发者_开发百科 event viewer is also not showing anything.

Thanks

As was also answered to this other question, a good way to get more detailed information on error 500 is to enable detailed error reporting:

Internet Information Services (IIS) Manager —> Your Web Site —> Error Pages -> Edit Feature Settings -> select "Detailed errors"