The Point-to-Point Tunneling Protocol (PPTP) is an obsolete method for implementing virtual private networks.PPTP has many well known security issues. PPTP uses a TCP control channel and a Generic Routing Encapsulation tunnel to encapsulate PPP packets.
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RE: VPN port 500 & 1723- how to check if ports are listening ROUTERKID1 (IS/IT--Management) 25 Apr 05 08:50 make sure you can ping your VPN server from a basic internet connection and check with AT&T to see what ports that require open.
le serveur VPN marche : je l'ai testé en local avec le client PPTP natif de windows XP . j'ai vu que PPTP utilise le Port TCP 1723 j'ai donc avec iptables fait les regles de redirection qui vont bien pour diriger le traffic TCP , port 1723 ( j'ai mis aussi l'UDP port 1723 ) vers le serveur VPN de mon reseau local
Disable your Windows Firewall or Norton Antivirus or another software which could block GRE protocol or port TCP 1723. Then try to connect. Remove your VPN connection from Windows, reboot your computer and configure the VPN connection again. Again try to connect. Try to connect directly without the router.
Below is a list of some common VPN protocols and the ports that they use: PPTP (Point-to-Point Tunneling Protocol) – This protocol uses port 1723 TCP. L2TP (Layer Two Tunneling Protocol) – This protocol uses port 1701 TCP, Port 500 UDP, and port 4500 UDP. Sep 05, 2015 · From the iPhone, I can connect to the Windows 7 test VPN over LAN or WAN (only with the default port number 1723). The iPhone could not connect to the Windows 7 test VPN through any alternate external port number. To enable VPN tunnels between individual host computers or entire networks that have a firewall between them, you must open the following ports: PPTP. To allow PPTP tunnel maintenance traffic, open TCP 1723. To allow PPTP tunneled data to pass through router, open Protocol ID 47. L2TP over IPSec. To allow Internet Key Exchange (IKE), open UDP 500.