Borderlands – What ports do I need open to host a game

borderlands-2pc

It seems that occasionally my friends and I have issues connecting with each other. I'm assuming this is a firewall/router issue, although it could be something else. Under Network Settings in the game, I have it set to 'Friends Only' so it shouldn't be an issue with my game settings.

Best Answer

Borderlands 2 uses steamworks, and according to Chrisf they don't use any other special ports, so the standard steam answers apply.

Source

Steam Client

UDP 27000 to 27015 inclusive (Game client traffic)
UDP 27015 to 27030 inclusive (Typically Matchmaking and HLTV)
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)

Also, there are several ISPs which block ports required for the proper operation of Steam and Steam games:

012.net (Steam traffic blocked)
Bluewin (Firewall blocks Steam from provider side - must be disabled through provider's service portal)
Dutch Telecom (Steam traffic blocked)
ISPFree (Steam traffic blocked)
Micronet Broadband (Steam traffic blocked)
TalkTalk (bandwidth throttling reduces download speeds)

Furthermore, Steam has their own connectivity support doc with the basic check your firewall, av software, etc. that you could try here.

The only interesting thing I see on it is starting steam with -tcp to force it to use all TCP ports instead of UDP, if that's messing something up on your end.

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