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What is OpenVPN?

OpenVPN is an open source VPN protocol that executes virtual private network (VPN) techniques for producing safe site-to-site or point-to-point connections in remote access facilities and bridged or routed configurations. OpenVPN uses a custom security protocol which utilizes TLS/SSL for key exchange. It is able to traverse firewalls and network address translators (NATs). James Yonan wrote it and published it under the GNU General Public License (GPL). 

OpenVPN allows peers to authenticate each other using username and password, certificates, or a pre-shared secret key. When used in a multi-client server configuration, it allows the server to launch an authentication certificate for every user using certificate authority and signature. It uses the OpenSSL encryption library broadly as well as TLSv1/SSLv3 protocols and consists of many control and security features.

At NordVPN, you can connect via OpenVPN both through TCP and UDP.
For OpenVPN TCP connections - port 443.
For OpenVPN UDP connections - port 1194.
You can read more about TCP vs UDP here.

You can set up an OpenVPN connection manually on different devices, guides for different devices can be found here:

For Windows : OpenVPN GUI

For macOS : Tunnelblick or Viscosity

For Linux : Terminal or Network Manager

For Android : OpenVPN GUI

For iOS : OpenVPN GUI

For Raspberry PI : Terminal



 

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