Installing OpenVPN on macOS X
Tunnelblick is free, being an open-source OpenVPN software created for Mac OS X. You can download the latest software from the Tunnelblick website in the downloads section. Execute the downloaded .dmg file and follow the instructions to install it.
At the end of the installation process, Tunnelblick will ask if you have any configuration files. If you haven’t used it before, select No and let Tunnelblick finish the initial process. Open a search window and execute the client.ovpn file, and Tunnelblick will install the client profile. Administrative rights are required.
How to connect to an OpenVPN server on macOS X
Launch Tunnelblick by opening Tunnelblick in the Applications folder. Once Tunnelblick is launched, an icon will appear in the menu bar in the upper right to control the connections. Click on the icon and then on the Connect menu to start the VPN connection. Select the correct client connection affiliated with the certificate imported earlier.
Installing OpenVPN on iOS
From the iTunes App Store, look for and install Open VPN Connect, the official iOS Open VPN client application. To transfer the iOS client configuration (or certificate) to the device, connect it directly to a computer.
The finalization of the transfer will be done using iTunes. Open iTunes on your computer and click iPhone> apps. Scroll to the bottom of the File Sharing section and click on the OpenVPN application. On the opened empty page on the right, navigate to the OpenVPN documents, which is for file sharing. Drag the .ovpn file into the OpenVPN Documents window.
Now launch OpenVPN on iPhone. There will be a notification that a new profile is ready to import. Touch the green plus sign to import it.
How to connect to an OpenVPN server on iOS
OpenVPN is now ready for use with the new profile. Start the connection by sliding the Connect button to the On position. Disconnect by sliding the knob to the Off position.
Note: The VPN switch under Settings cannot be used to connect to the VPN network. If you try, you will receive a notification to connect only using the OpenVPN application.