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Open a port with ufw

caution rootFirewalldebian, ubuntu

Caution: This command changes the system. Understand what it does before you run it.

Adjust the values, the command updates live
root@server
ufw allow 443/tcp

Creates a rule that allows incoming connections on the given port, for IPv4 and IPv6 at the same time. The rule is active immediately and persists after a reboot. Without /tcp or /udp, the rule applies to both protocols.

Note: On Plesk servers, do not use ufw alongside the Plesk firewall extension. Both write to the same netfilter tables and can overwrite each other.

Also searched as

  • ufw allow port
  • open port 443 ufw
  • ufw allow tcp port

Related one-liners

All in Firewall

Close a port in ufw by deleting its rule

#ufw delete allow 8080/tcp
cautionFirewall

Allow a port only from a specific IP with ufw

#ufw allow from 198.51.100.0/24 to any port 22 proto tcp
cautionFirewall

Block an IP address or subnet with ufw

#ufw insert 1 deny from 203.0.113.0/24
cautionFirewall

Count IP addresses blocked by ufw

#journalctl -k --since "today" --no-pager | grep 'UFW BLOCK' | grep -o 'SRC=[^ ]*' | sort | uniq -c | sort -rn | head -20
harmlessFirewall

Delete a ufw rule by number

#ufw delete 3
cautionFirewall

Enable ufw logging

#ufw logging low
cautionFirewall

Read first, then run.

The commands on myline.de act directly on servers, files and databases. A wrong path or placeholder can delete data irreversibly or make a server unreachable.

  • All commands are provided without warranty and are not tested on every system.
  • Understand what a command does before running it, and check every placeholder.
  • Make a backup first and, if possible, try it on a test system.
  • You run commands at your own risk. Liability for damages is excluded to the extent permitted by law.