What is VPN How does the firewall work

Which ports must be opened on the router / firewall for the VPN server under Windows?

Virtual Private Network called VPN for short

Windows version 2000 or higher offer a real VPN server, i.e. a user can log into the VPN server computer from outside via a VPN tunnel.

For this to work smoothly, PPTP on the router or the firewall of the Port 1723 TCP as well as that Protocol GRE (protocol ID 47) to the Server computer forwarded or allowed through.

In a Fritz box it looks like this.

For L2TP over IPSec have to oppose it UDP 500 (for Internet Key Exchange)

UDP 5500 (for IPsec Network Address Translation = NAT-T) and

UDP 1701 (for L2TP traffic)

released or forwarded.

Further information on VPN can be found in our article VPN network with Windows XP.

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Which ports must be opened on the router / firewall for the VPN server under Windows?
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