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Which ports do you need to open on a firewall to allow PPTP and L2TP over IPSec VPN tunnels?
A. 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
John Savill
June 19, 2005
1 Min Read
A. 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.
To allow IPSec Network Address Translation (NAT-T) open UDP 5500.
To allow L2TP traffic, open UDP 1701.
Learn more: Enabling a Windows Firewall Exception for Port 445
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