Linux firewall rules control which inbound connections can reach services on your VPS. Open only the ports your software needs, and make sure the service is running before testing from outside.

Ubuntu or Debian with UFW

Allow a TCP port:

sudo ufw allow 7777/tcp

Allow a UDP port:

sudo ufw allow 7777/udp

Check status:

sudo ufw status

AlmaLinux, Rocky Linux, or Oracle Linux with firewalld

sudo firewall-cmd --permanent --add-port=7777/tcp
sudo firewall-cmd --reload

For UDP, replace tcp with udp. If your VPS also has a panel firewall plan, allow the same ports there too.

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