Problem scenario
You have an existing GitLab set up on a Linux server. You have access to the back-end. You want to find the port number to connect to. How do you do this?
Solution
First find the external IP address (e.g., curl icanhazip)
Second, install nmap (e.g., sudo yum -y install nmap or sudo apt-get -y install nmap).
Three run this command (but replace x.x.x.x with the IP address found in the first step above):nmap -Pn x.x.x.x | grep open