Port 999
applix, garcon and puprouter · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | applix, garcon and puprouter |
Frequently asked questions
What is port 999 used for?
Port 999 is registered with the IANA for applix, garcon and puprouter (TCP/UDP). Description: ; Applix ac.
Is port 999 a well-known port?
Yes. Port 999 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 999 is open?
Locally on Linux with ss -tulpn | grep ':999\b', on Windows with netstat -ano | findstr :999. To test a remote host use Test-NetConnection <host> -Port 999 in PowerShell or nc -zv <host> 999 on Linux/macOS.
How do I open port 999 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 999/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=999/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 999" -Direction Inbound -Protocol TCP -LocalPort 999 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | garcon | |
| UDP | applix | Applix ac |
| TCP | puprouter | |
| UDP | puprouter |