Byc moze jest to kwestia pozamykanych portow, jesli chodzi o HLSW to korzysta ono z protokolu Gamespy, a wg wiki HLSW odblokowane powinny byc porty:
3. How do I setup my server behind a firewall?
If you do not care about (or want) the server being listed in Ga*spy, then you only need to open udp port 14567 into your network. If you are behind a firewall/router that is also doing NAT, you will need to port forward udp port 14567 from your firewall/router to your internal server. On some routers you may also make your server a 'DMZ' host which effectively puts the server on the outside of the firewall. However, please realize that exposes your server and all of its potentially open ports (and exploitable code) to the rest of the dirty public internet
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If you do want your server to be listed in Gamespy you will need a number of additional ports opened up:
allow udp port 14567
allow udp 22000 (THIS IS ONLY FOR LAN GAMES. If you don't want that accessible from the net, don't open it)
allow udp range 23000 23009
1. Gamespy Master Server UDP Heartbeat allow udp port 27900
2. Gamespy Master Server List Request allow tcp port 28900
In addition you may or may not
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need to open the ports listed in the "Working Around the Firewall / Proxy" section of this Gamespy page:
http://www.gamespyarcade.com/support/firewalls.shtml (thanks to mibsc123 for the link)