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Which ports should I have open for Steam?

Your network must be configured to allow Steam access to the following ports (in order from highest to lowest priority for QoS users):
 
Steam Client
UDP 27000 to 27015 inclusive (Game client traffic)
UDP 27015 to 27030 inclusive (Typically Matchmaking and HLTV)
TCP 27014 to 27050 inclusive (Steam downloads)
UDP 4380 
 
Dedicated or Listen Servers
TCP 27015 (SRCDS Rcon port) 
 
Steamworks P2P Networking and Steam Voice Chat
UDP 3478 (Outbound)
UDP 4379 (Outbound)
UDP 4380 (Outbound) 
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