Port 1823
unisys-lm · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | unisys-lm |
Frequently asked questions
What is port 1823 used for?
Port 1823 is registered with the IANA for unisys-lm (TCP/UDP). Description: Unisys Natural Language License Manager.
Is port 1823 a well-known port?
No. Port 1823 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 1823 is open?
Locally on Linux with ss -tulpn | grep ':1823\b', on Windows with netstat -ano | findstr :1823. To test a remote host use Test-NetConnection <host> -Port 1823 in PowerShell or nc -zv <host> 1823 on Linux/macOS.
How do I open port 1823 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 1823/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=1823/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 1823" -Direction Inbound -Protocol TCP -LocalPort 1823 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | unisys-lm | Unisys Natural Language License Manager |
| UDP | unisys-lm | Unisys Natural Language License Manager |