Setting up VPN on Mac 10.7 Lion & 10.8 Mountain Lion
Here you will find the setup guide for your Mac OS X 10.7 lion and 10.8 Mountain Lion. We will begin with PPTP VPN and proceed with L2TP IPsec VPN. Two different types of VPN protocols and it may be a good idea to create one of each. If one fails to connect depending on how restrtictive your network, you try the second connection.
When travellign abroad to countries such as China, Thailand, Malaysia, United Arab Emirates, Qatar, Oman, Kingdom of Saudi Arabia, Belize etc you should know that one of both protocols MIGHT fail to connect. Simply use the other. This could also occur in the US. Just depends on the network being used.
Users who already had the vpn configured on Mac 10.7 reported an issue when upgrading to 10.7. The VPN had to be removed and re-added from scratch. This seems to resolve the issue..