http://www.wikihow.com/Bypass-Fortiguard http://www.criticalsecurity.net/index.php?showtopic=30087 i hope these links can help u
h__p://securityvulns.com/Sdocument792.html replace _ by 'tt' Try this one. It has got some good stuff.
There's one surefire way that I know of... set up an ssh server on an outside computer, then tunnel all your traffic through it. Plenty of tutorials for both of those activities on google. It's very easy to do. Might be a bit slower, but since you can change the port that sshd listens on, you can always tunnel your traffic through an unblocked port. A nice bonus is that all your traffic will now be encrypted.