I am a new guy here, so please feel free to move my post to a different category if you would consider that it was posted in the improper one.
I have occurred a 500 server error while building a site on Drupal 6.38 and it's driving me crazy.
I know, it's a pretty old one, but I had no choice in this case. :)
Just to specify - there is a description for the error showed by the web browser, talking that server can not handle the request at this moment.
I did a little research and a few test. Please take a look what I have found: