Port 500 — IKE

UDP · Port 500 is used for Internet Key Exchange (IKE) over UDP, which is a protocol used to establish and maintain VPN connections. This port plays a crucial role in secure remote access and site-to-site VPNs.

Port Number: 500
Service Name: IKE
Protocol: UDP
Common Software: strongSwan, Openswan

Security Notes

Review IANA registry for port 500 usage. Apply principle of least privilege - only open ports that are required.

FAQ

What is port 500 used for?

Port 500 is used for IKE. Port 500 is used for Internet Key Exchange (IKE) over UDP, which is a protocol used to establish and maintain VPN connections. This port plays a crucial role in secure remote access and site-to-site VPNs. Common software: strongSwan, Openswan.

Is port 500 dangerous to leave open?

Review IANA registry for port 500 usage. Apply principle of least privilege - only open ports that are required.

How do I check if port 500 is open?

Use nmap: nmap -p 500 <target> or check locally: ss -tlnp | rg 500