IIS 7 and Above
Intermittent 500 Internal Service Error
Last post Jun 12, 2012 02:36 AM by dotnetnerd
Jun 10, 2012 09:22 PM|nsetia|LINK
Jun 11, 2012 08:53 PM|peterviola|LINK
It's hard to say without a detailed error message. Check the Application and System event viewer to see if anything is being logged.
If the site has a web.config turn off Custom Errors. Disable 'Show Friendly Errors' in your browser.
Try enabling Failed Request Tracing and see if that offers any additional clues:
Jun 12, 2012 02:36 AM|dotnetnerd|LINK
You need to check full error message on the server as 500 internal server error means a lot. :)