UDP: Typically, ISAKMP uses UDP as its transport protocol. ISAKMP traffic normally goes over UDP port 500, unless NAT-T is used in which case UDP port 4500 is used. Example traffic. XXX - Add example decoded traffic for this protocol here (as plain text or Wireshark screenshot). Wireshark

Select protocol: generally "tcp and udp" or "tcp" are common. KEY: click radio button "The rule will apply only if it matches all of the ports listed below:" The add button will become available. Click "Add". Specify Ports: Click radio button "Individually specified ports", enter port number. Click "Ok" Click "Next" Port 4500 (tcp/udp) :: SpeedGuide 500/udp - Internet Key Exchange (IKE) 4500/udp - NAT traversal See also: port 1701 (L2TP) port 1723 (PPTP) Mac OS X Server VPN service, Back to My Mac (MobileMe, Mac OS X v10.5 or later), Vodafone Sure Signal also use this port. Abacast peer-to-peer audio and video streaming also uses port 4500 (TCP/UDP) USG20W-VPN UDP Port 500 open — Zyxel

UDP Scan (-sU) | Nmap Network Scanning

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RandomNerd: How to verify UDP port 500 (IPSec VPN) is open

Oct 21, 2019 UDP connect, check port: Check host - online website Check UDP connection to any port of any IP or website from different places.. For example you could check a DNS or game server for availability from many countries. Examples:. domain:// cw.live-cs.ru:27997 Port 4500 (tcp/udp) - Online TCP UDP port finder Mar 30, 2016 Protocols/isakmp - The Wireshark Wiki