The SpyOFF client offers various protocols for establishing a connection with a VPN:
Ultra-Secure (Open VPN)
The best solution. Both fast and very safe.
A good alternative to Open VPN. More secure than PPTP, however, speed loss my occur.
Very easy to set up and fastest internet connection.
However, security issues may occur here.
Firewall and Router Settings
The PPTP and L2TP passthrough must be enabled. This setting must be made both in the router and in the firewall. If this option is not displayed in the router menu, it does not provide a connection to PPTP or L2TP.
To allow PPTP traffic, open TCP port 1723. "