Windows Firewall open PPTP poorthttps://i1.wp.com/windowstechblog.nl/wp-content/uploads/2014/07/Windows-Firewall-open-PPTP-poort.png?fit=677%2C343&ssl=1https://i1.wp.com/windowstechblog.nl/wp-content/uploads/2014/07/Windows-Firewall-open-PPTP-poort.png?resize=150%2C150&ssl=1Martien van Dijkit's all about Microsoft