It's a pretty important thing to know. This almost could have fit in the security section of the site, 'cause you shouldn't have open ports unless you know why they're open. Of course, most open ports are benign, useful, and intended - you still need to be able to identify what is running on what port.
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Let's Use 'netstat' To Find Out What Process Is Listening On A Specific Port • Linux Tips
Today's article is going to teach you how to use 'netstat' to find out what process is listening on a specific port.
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