Port 514 — Syslog

Q: How can this port be checked?

First confirm that the collector is listening with ss -lntup or an equivalent tool. For TCP, nc -vz SERVER 514 can test the connection. For UDP, review collector logs and use a packet capture with udp.port == 514 instead of relying on a simple port probe.

TopicMicrosoft 365 →

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Port514

TransportUDP/TCP

ServiceSyslog

Port 514UDP/TCP

Transmits Syslog messages to a central log collector.

What is Port 514 used for?

Logging and monitoring. The protocol or service commonly associated with this port is Syslog.

Role and operation

Many devices send Syslog messages to a central server over UDP 514; some implementations also support TCP 514. UDP is simple but does not guarantee delivery or ordering. TCP provides a reliable session but does not by itself add encryption. Syslog protected with TLS commonly uses a dedicated port depending on the implementation.

Transport protocol

UDP/TCP

Security precautions

Plain UDP/TCP 514 can expose log contents and allow message spoofing on an untrusted network. Restrict permitted sources and prefer a TLS-protected variant for sensitive logs when supported by the devices.

Should this port be opened in the firewall?

Open the port only from authorized devices to the Syslog collector. Avoid broad rules between networks and do not publish the collector directly to the Internet.

How can this port be checked?

First confirm that the collector is listening with ss -lntup or an equivalent tool. For TCP, nc -vz SERVER 514 can test the connection. For UDP, review collector logs and use a packet capture with udp.port == 514 instead of relying on a simple port probe.

The exact transport depends on the product. For encrypted Syslog, verify the configured TLS profile and destination port on both sender and collector.