Port 514 (UDP & TCP) — Syslog Telemetry
Syslog aggregates router, firewall, switch, and Linux daemon event logs into centralized SIEM and observability collectors.
| Port Number | 514 |
|---|---|
| Transport Protocol | UDP & TCP |
| Primary Service | Syslog Telemetry |
| Standard / Specification | RFC 5424 |
| IANA Port Range | Well-Known System Port (0–1023) |
| Internet Exposure Risk | Unencrypted log transport; never send compliance or security logs over public networks on 514. |
Firewall Architecture & Hardening Best Practices
Restrict UDP/514 and TCP/514 strictly to out-of-band management VLANs; for cross-site or cloud SIEM forwarding, use TLS-encrypted Syslog over TCP/6514.
Operational Troubleshooting Note
UDP/514 is fire-and-forget and can silently drop bursts under load—prefer TCP/514 or TCP/6514 for reliable audit logging.
Quick CLI Connectivity & Firewall Reference
# Test TCP/514 reachability (Linux / macOS / PowerShell) nc -zv target.example.com 514 Test-NetConnection -ComputerName target.example.com -Port 514 # Inspect local UDP/514 socket binding on Linux ss -uapn | grep :514 # Allow restricted CIDR on Linux UFW firewall ufw allow from 10.0.0.0/8 to any port 514 proto any
Planning firewall allowlists or VPN overlays? Use our IPv4 CIDR Calculator, MTU & TCP MSS Calculator, or WireGuard AllowedIPs Generator.
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