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Port

Port 500

Conventionally used by IPsec IKE. Port assignments are conventions, so confirm the actual listener before you write a rule around this number.

UDPEncrypted: Yes

Protocols on this port

IPsec IKE

VPN security association negotiation

Security: Disable legacy proposals such as 3DES and MODP-1024

UDP · Encrypted: Yes

Where this port appears in the documentation

VPN

A virtual private network carries private traffic across untrusted networks inside an authenticated, encrypted tunnel.

Exposure guidance

Decide reachability from the identity of the caller, not from the port number. If the service on this port carries credentials or administrative control, restrict it to an administrative network, require strong authentication, and log every session that reaches it.

Nearby ports

Port 464Port 514

In the knowledge graph

Open the interactive map centred on this entity to see everything it connects to and travel outwards from there.

Explore port 500 in the knowledge graph