Tools / Port checker / 27015
Is port 27015 open?
Port 27015 is Steam / Source game servers. Enter your server below to test it from Dallas, Amsterdam and London.
What port 27015 is used for
Default for Source engine game servers such as Counter-Strike, Garry's Mod and Team Fortress 2, including RCON over TCP.
Should port 27015 be open?
Normal to open to the internet. Set a strong RCON password or disable RCON; game traffic itself is mostly UDP on the same port.
How to open port 27015
Ubuntu or Debian with ufw:
sudo ufw allow 27015/tcp
Rocky, Alma or CentOS with firewalld:
sudo firewall-cmd --permanent --add-port=27015/tcp && sudo firewall-cmd --reload
Windows Server, in PowerShell as administrator:
New-NetFirewallRule -DisplayName "Port 27015" -Direction Inbound -Protocol TCP -LocalPort 27015 -Action Allow
Then check that the service listens on all addresses, not only 127.0.0.1, and test again above.
Check another port
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Run your service on a PrivateByte server: a firewall you control and every port yours to open.