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

2. I added two port triggers, one for UDP 500 and one for UDP 4500. The timeout is set to 20 minutes. (the timeout might be part of my new problem - SEE BELOW) This allowed me to get it connected with the Android app. NEW PROBLEM. The camera disconnects after a while. Again this may be due to the timeout setting for port triggering. Solved: Opening ports UDP 500, 4500 and 123 - HughesNet Re: Opening ports UDP 500, 4500 and 123 The ports are "open", however, you are behind CGN, so port-forwarding isn't possible. It's a known issue here in the community, and the devices are not supported either by Hughesnet, nor TMobile when connecting over satellite. Firewall Block Port 500 - Spiceworks Dec 09, 2015

Jul 21, 2016

Apr 30, 2017 TCPやUDPにおけるポート番号の一覧 - Wikipedia 500: TCP: UDP: Internet Security Association and Key Management Protocol (ISAKMP) 公式 502: TCP: UDP: Modbus Protocol: 公式 504: TCP: UDP: Citadel, multiservice protocol for dedicated clients for the Citadel groupware system: UDP: Default port for most Endless Online-based servers

Nov 22, 2016

Are UDP 500, 1701 and 4500 ports being blocked -- VPN I recently set up a VPN back into my network (for use on public wi-fi, keep they prying eyes away). Everything was working and now it is not. I checked the access to the port via the internet and they are now closed. Is VZ blocking UDP 500, 1701 and 4500 now. PCI Compliance failed UDP port 500 - Peplink Balance Mar 12, 2019 UDP communication is blocked by the Windows Firewall rule