I run a server on a Linux box as well, everything works fine and I forwarded some of the ports you specified plus a few more. I don't think most Linux distros come with firewalls or antivirus pre-installed, or if installed, doesn't usually cause problems, so I wouldn't expect that to be the problem.
TCP: 1200, 27000-27020
UDP: 27015, 27020-27050
I really can't say what all these ports do, but the server just works for me. :>
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