What UDP Port is Used for IKE Traffic from a VPN Client to Server?
IKE traffic uses UDP port 500. If you have a firewall between the VPN client and server, you must open UDP port 500 to allow IKE traffic to pass. Checkout this video: Introduction IKE uses UDP port 500 for IKE phase 1 traffic and UDP port 4500 for IKE phase 2 traffic. What is IKE? … Read more