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)

How to open UDP port 500 & 4500 in Windows 7 Pro How to open UDP port 500 & 4500 in Windows 7 Pro. By parthasarathi.4u · 10 years ago How to open UDP port 500 & 4500 in Windows 7 Professional OSD failing and UDP port 500 - social.technet.microsoft.com Nov 22, 2016

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Mar 30, 2016

How to allow port 50,51,500 for IPSec p - Cisco Community

UDP 500 - Port Protocol Information and Warning! UDP Port 500 may use a defined protocol to communicate depending on the application. A protocol is a set of formalized rules that explains how data is communicated over a network. Think of it as the language spoken between computers to help them communicate more efficiently. GRC | Port Authority, for Internet Port 500 Port 500 is used by most IPSEC-based VPN systems for the establishment of securely encrypted "tunnels" between endpoint machines. Users of firewalls or routers that must pass or negotiate VPN connections may need to allow UDP traffic to cross on port 500. Feed Detail UDP port 500 is the ISAKMP port for establishing PHASE 1 of IPSEC tunnnel. VPN-GW1-----nat rtr-----natrtr-----VPNGW2. If two vpn routers are behind a nat device or either one of them, then you will need to do NAT traversal which uses port 4500 to successfully establish the complete IPEC tunnel over NAT devices. How do I close UDP Port 500? - Firewall and Policies - XG