Why do i get server error 0004 when i am trying to play an online casino game?

Try adjusting your secuity settings. I'm pretty sure "4000" is the error the server gives when it tries to parse information back to a secure site.

Or you might be able to just adjust the fire wall settings in windows. make sure that "under the Fire wall > general tab> "Block all incomming connections" is not selected. and then retry. Just a thought.