Is there a 'help' option somewhere in Ghostwall that you can use to check for config instructions? Have you tried disabling it (just for a little while) to see if LW connects then?

Can you ask the person who installed Ghostwall if they can show you how to add rules for LW (sorry, I've never used that particular firewall)? Check the thread below (it's from a different forum), it might help a bit:
http://www.wilderssecurity.com/showthread.php?t=117458

I can't find any specific config instructions but maybe someone else here uses it & can help you out??