Port 678
ggf-ncp · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | ggf-ncp |
Frequently asked questions
What is port 678 used for?
Port 678 is registered with the IANA for ggf-ncp (TCP/UDP). Description: GNU Generation Foundation NCP.
Is port 678 a well-known port?
Yes. Port 678 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 678 is open?
Locally on Linux with ss -tulpn | grep ':678\b', on Windows with netstat -ano | findstr :678. To test a remote host use Test-NetConnection <host> -Port 678 in PowerShell or nc -zv <host> 678 on Linux/macOS.
How do I open port 678 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 678/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=678/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 678" -Direction Inbound -Protocol TCP -LocalPort 678 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | ggf-ncp | GNU Generation Foundation NCP |
| UDP | ggf-ncp | GNU Generation Foundation NCP |