Which ports to forward for a VPN server that sits behind a firewall?

networking windows-server-2008 vpn

Question pretty much says it all.

From what I have found, it seems that port 1723 is the main port to forward, but I also see numerous references to others ports.

The server that is hosting the VPN is a Windows 2008 Server.


Solution 1:

What protocol is the VPN server using, PPTP, L2TP, IPSEC?

  • PPTP uses TCP port 1723 and protocol 47
  • L2TP uses UDP port 1701
  • IPSEC uses UDP port 500 and protocols 50 and 51

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