I made one at work with the following ports open on our DMZ firewall during a virtual environment.
Steam Friends Service UDP 1200 1200
Steam Main UDP UDP 27000 27015
Steam Main TCP TCP 27020 27039
Steam CyberCafe TCP 27040 27041
Steam Dedicated Server HLDS, SRCDS UDP 27015 27015
Steam Dedicated Server HLTV UDP 27020 27020
Steam SRCDS Rcon TCP 27015 27015
It shows up in the list with: In server config with the rest being defaults.
setmaster add hl2master.steampowered.com
heartbeat
Let me know the results.
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