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Let me edit the list a little for you:
Steam Friends Service TCP/UDP 1200
Steam Main UDP 27000 & 27015
Steam Main TCP 27020 & 27039
Steam CyberCafe TCP 27040 & 27041
Steam Dedicated Server HLDS, SRCDS UDP 27015
Steam Dedicated Server HLTV TCP/UDP 27020
Steam SRCDS Rcon TCP 27015
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