Pritunl is an easy-to-use, open-source VPN server with an intuitive web management interface. [Vultr's One-Click Pritunl server](https://www.vultr.com/apps/pritunl) is the easiest way to set up a VPN server using OpenVPN protocol. When you follow this tutorial, Pritunl will install a Let's Encrypt SSL certificate, which requires a fully-qualified domain name (FQDN) to assign the SSL Certificate. Make sure you have a domain name and can assign an IP address with your DNS provider. > This guide us......