Port 127
locus-con · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | locus-con |
Frequently asked questions
What is port 127 used for?
Port 127 is registered with the IANA for locus-con (TCP/UDP). Description: Locus PC-Interface Conn Server.
Is port 127 a well-known port?
Yes. Port 127 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 127 is open?
Locally on Linux with ss -tulpn | grep ':127\b', on Windows with netstat -ano | findstr :127. To test a remote host use Test-NetConnection <host> -Port 127 in PowerShell or nc -zv <host> 127 on Linux/macOS.
How do I open port 127 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 127/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=127/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 127" -Direction Inbound -Protocol TCP -LocalPort 127 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | locus-con | Locus PC-Interface Conn Server |
| UDP | locus-con | Locus PC-Interface Conn Server |