Ports in Borderlands

Here are the basic ports for hosting a game server :

7777 (TCP/UDP)
28900 (TCP)
27900 (UDP)
28910 (TCP)

However, if you don’t manage to work things out, it could be the fault of the Windows Firewall. You must add the ports for Borderlands to go outside and receive connections for inbound.

More Ports:
3783 (Voice Chat Port)
27900 (Master Server UDP Heartbeat)
28900 (Master Server List Request)
29900 (GP Connection Manager)
29901 (GP Search Manager)
13139 (Custom UDP Pings)
6515 (Dplay UDP)
6500 (Query Port)

It appears that those 2 ports are the most important ones:
6515 (Dplay UDP)
6500 (Query Port)


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