I installed guarddog. I found that I am "stealth" according to grc.com, but mutt doesn't work, http://www.srf.ch/radio-srf-4-news/player
loads fully now, but still no sound ....
If I were an administrator, I would learn iptables, most likely, but I am but a user with a steep learning curve that gets steeper as I grow older, it would seem (call me lazy). I was using firestarter for years with no problem, only recently I noticed that I was not fully "stealth", and decided to try other front-ends for iptables. Once I figure out how to make everything I use, I'll be OK again--learning iptables would be a bit too much for me. Sorry.