Port 423
opc-job-start · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | opc-job-start |
Frequently asked questions
What is port 423 used for?
Port 423 is registered with the IANA for opc-job-start (TCP/UDP). Description: IBM Operations Planning and Control Start.
Is port 423 a well-known port?
Yes. Port 423 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 423 is open?
Locally on Linux with ss -tulpn | grep ':423\b', on Windows with netstat -ano | findstr :423. To test a remote host use Test-NetConnection <host> -Port 423 in PowerShell or nc -zv <host> 423 on Linux/macOS.
How do I open port 423 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 423/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=423/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 423" -Direction Inbound -Protocol TCP -LocalPort 423 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | opc-job-start | IBM Operations Planning and Control Start |
| UDP | opc-job-start | IBM Operations Planning and Control Start |