Do Suporte Steam, Portas Necessárias para o Steam :
To log into Steam and download content:
- HTTP (TCP port 80) and HTTPS (443)
- UDP 27015 through 27030
- TCP 27015 through 27030
Steam Client
- UDP 27000 to 27015 inclusive (Game client traffic)
- UDP 27015 to 27030 inclusive (Typically Matchmaking and HLTV)
- UDP 27031 and 27036 (incoming, for In-Home Streaming)
- TCP 27036 and 27037 (incoming, for In-Home Streaming)
- 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)