Again, netstat helped me troubleshoot an application that wasn’t working. After rattling our brains over an update for about 30mins, netstat confirmed the update closed the ports needed for the application to function.
Along with the normal ping command, netstat is so useful:
netstat | Microsoft Learn
For Linux, ss command is now netstat’s replacement:
Linux tools: How to use the ss command | Enable Sysadmin (redhat.com)