A site that I look after recently had a service pack applied to their BM
server. Since then only proxy services can get out. They used to run
netmeeting by unloading the filtserv on the console and reloading it after -
that no longer works.

I spent a short period of time on site a few weeks ago and discovered FTP
didn't work either even with the filters unloaded. I configured the FTP
proxy, but could only get that to work by adding reverse entries ports 20 &
21 as well as forward entries. It looked to my like the private/public
entries had been reversed but they were okay.