Port 5999
cvsup · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | cvsup |
Frequently asked questions
What is port 5999 used for?
Port 5999 is registered with the IANA for cvsup (TCP/UDP). Description: CVSup.
Is port 5999 a well-known port?
No. Port 5999 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 5999 is open?
Locally on Linux with ss -tulpn | grep ':5999\b', on Windows with netstat -ano | findstr :5999. To test a remote host use Test-NetConnection <host> -Port 5999 in PowerShell or nc -zv <host> 5999 on Linux/macOS.
How do I open port 5999 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 5999/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=5999/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 5999" -Direction Inbound -Protocol TCP -LocalPort 5999 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | cvsup | CVSup |
| UDP | cvsup | CVSup |