Port 3431
ndl-als · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | ndl-als |
| Registered | 2002-03 |
Frequently asked questions
What is port 3431 used for?
Port 3431 is registered with the IANA for ndl-als (TCP/UDP). Description: Active License Server Port.
Is port 3431 a well-known port?
No. Port 3431 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 3431 is open?
Locally on Linux with ss -tulpn | grep ':3431\b', on Windows with netstat -ano | findstr :3431. To test a remote host use Test-NetConnection <host> -Port 3431 in PowerShell or nc -zv <host> 3431 on Linux/macOS.
How do I open port 3431 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 3431/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3431/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3431" -Direction Inbound -Protocol TCP -LocalPort 3431 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | ndl-als | Active License Server Port |
| UDP | ndl-als | Active License Server Port |