Port 514 supports Remote Shell and Syslog across distinct transports. Review each protocol before writing firewall or monitoring policy.
Historic Unix remote shell and command execution.
Remote Shell endpoints in environments where this service is explicitly configured.
Client to server
Unencrypted and trust-based; replace with SSH.
Traditional connectionless transport for syslog messages.
Network devices and Unix systems forwarding logs to collectors.
Server to client
UDP provides no delivery, authentication, or confidentiality guarantees. Prefer syslog over TLS on TCP 6514 where supported.