by zep
4. WHICH PORTS DO I NEED TO OPEN ON MY ROUTER FOR STEAM?
Answer:
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 27020 to 27050 inclusive (Steam downloads)
Dedicated or Listen Servers:
•TCP 27015 (SRCDS Rcon port)