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
ITPro Today logo in a gray background | ITPro Today

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

About the Author

Sign up for the ITPro Today newsletter
Stay on top of the IT universe with commentary, news analysis, how-to's, and tips delivered to your inbox daily.

You May Also Like