Intermediate7 min read
Set up a game server with the right ports and firewall rules
Open only what the title needs, and confirm it from outside the machine.
Last updated 1 August 2026
Every title has its own port requirements, and many need UDP rather than TCP. Check the publisher documentation for the exact list before you open anything.
A default-deny ruleset
bash
ufw default deny incoming
ufw default allow outgoing
ufw allow 22/tcp
ufw allow 27015/udp
ufw enableConfirm from outside
Testing from the server itself proves nothing. Check from another machine, on another network.
bash
nc -vzu 203.0.113.24 27015Pick the region before you publish the address
Moving a game server after players have saved the address is disruptive. Confirm regional stock first.Was this page useful?
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