What port does Syslog use?
Syslog uses port 514 over UDP.
| Port | Protocol | Name | What it is for |
|---|---|---|---|
| 514 | UDP | Syslog | Remote logging. |
What catches people out
UDP syslog has no authentication and no delivery guarantee. Use TLS syslog on 6514 for anything that matters.
Checking it is listening
sudo lsof -i :514 # macOS, Linux
netstat -ano | findstr :514 # Windows
nc -zuv host 514 # from elsewhere (-u because this is UDP)An "address already in use" error on a port nothing appears to be holding usually means the socket is in TIME_WAIT rather than that a process has it — the ports reference covers that and the ephemeral range.
Frequently asked questions
What port does Syslog use?
Syslog uses port 514 over UDP. Remote logging.
What should I watch out for with port 514?
UDP syslog has no authentication and no delivery guarantee. Use TLS syslog on 6514 for anything that matters.
How do I check whether Syslog is listening?
sudo lsof -i :514 on macOS or Linux, netstat -ano | findstr :514 on Windows. From another machine, nc -zuv host 514 says whether anything answers.
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