You can also find two strategies to block and open up ports, incoming and outgoing. The subsequent diagram will expose additional: You may need to install Ruby from a third-get together PPA for getting the latest Model. Here's a step-by-action manual on how to install Ruby and increase the PPA. https://throbsocial.com/story18464078/the-smart-trick-of-nginx-ssl-certificate-install-that-nobody-is-discussing