We support 5 common VPN protocols including PPTP, L2TP, OpenVPN, Cisco AnyConnect, and Kerio VPN. Depends on the country you are living in or your network limitations, there is a possibility that some protocols are blocked by your internet provider. You may experience slow speed also. As an example, in China, most clients can’t connect through the PPTP and L2TP. They must use OpenVPN, Kerio VPN, or Cisco AnyConnect. You should try all protocols to see which one works better for you. Check the Setup Tutorial page.