When troubleshooting network issues on server side you will will want to know if socket is open on the server side. It is often important to know which process is listening on this socket as well.

I recently ran into an issue where certificate verification on my Linux Mint desktop started failing. Some of the errors included apt failing to perform CA validation.

SSH authentication forwarding allows you to use private key on your local machine to connect to other machines. For example if the only way you are allowed to access Linux/Unix servers in your environment is through a bastion host follow the steps below.