Port 18243
clusterxl · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | clusterxl |
| Registered | 2012-06-28 |
Frequently asked questions
What is port 18243 used for?
Port 18243 is registered with the IANA for clusterxl (TCP/UDP). Description: Checkpoint router state backup; Reserved.
Is port 18243 a well-known port?
No. Port 18243 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 18243 is open?
Locally on Linux with ss -tulpn | grep ':18243\b', on Windows with netstat -ano | findstr :18243. To test a remote host use Test-NetConnection <host> -Port 18243 in PowerShell or nc -zv <host> 18243 on Linux/macOS.
How do I open port 18243 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 18243/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=18243/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 18243" -Direction Inbound -Protocol TCP -LocalPort 18243 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | clusterxl | Checkpoint router state backup |
| UDP | – | Reserved |