Port 390
uis · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | uis |
Frequently asked questions
What is port 390 used for?
Port 390 is registered with the IANA for uis (TCP/UDP). Description: UIS.
Is port 390 a well-known port?
Yes. Port 390 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 390 is open?
Locally on Linux with ss -tulpn | grep ':390\b', on Windows with netstat -ano | findstr :390. To test a remote host use Test-NetConnection <host> -Port 390 in PowerShell or nc -zv <host> 390 on Linux/macOS.
How do I open port 390 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 390/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=390/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 390" -Direction Inbound -Protocol TCP -LocalPort 390 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | uis | UIS |
| UDP | uis | UIS |