This guide explains how to manually set up a L2TP VPN connection on Mac OS and start using the VPN99 service.
Step 1.
Open System Preferences.
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Step 2.
Click Network.
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Step 3.
Click +.
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Step 4.
Choose VPN as Interface.
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Step 5.
Select L2TP as VPN Type:
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Step 6.
Use VPN99 L2TP as Service Name.
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Step 7.
In the Server address field, type in nl.vpn99.net as Server Address for connecting to
Netherlands and us.vpn99.net for USA and ru.vpn99.net for Russia Enter your Login in the Account Name field, then click Authentication Settings...
(You will receive Login and Password after Sign UP)
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Step 8.
... and type in your Password, Shared Secret - 12345678 then click OK 
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Step 9.
Click Advanced.
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Step 10.
In the Options tab we recommend that you use the settings the way it is shown on the screenshot and click OK.
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Step 11.
Check "Show VPN status in menu bar" option, then click Apply.
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Step 12.
Click Connect.
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Step 13.
VPN99 is now connected! Enjoy it!
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Step 14.
To disconnect, open System Preferences -> Network, choose VPN99 and press Disconnect.
If you have any further questions please don't hesitate to contact us.