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Editor to share with you how to view the port being monitored under Linux, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

First of all, you must know that the port does not exist independently, it is attached to the process. When a process is opened, its corresponding port is opened, and when the process is closed, the port is closed. The next time a process is opened again, the corresponding port will be opened again. It should not be simply understood as shutting down a port, but you can disable a port.

\ 1. You can use "netstat-anp" to see which ports are open.

(note: adding the parameter-n will convert the application to port display, that is, addresses in numeric format, such as nfs- > 2049 and ftp- > 21, so you can open two terminals and correspond to the corresponding port numbers of the program one by one.)

\ 2. You can then use "lsof-I: to see the program that applies the port (PORT refers to the corresponding port number)." Or you can check the file / etc/services, from which you can find out the service corresponding to the port. (note: some ports cannot be found by netstat, a more reliable method is "sudo nmap-sT-O localhost")\ 3. To close a port, you can: 1) disable the port through the iptables tool, such as "sudo iptables-An INPUT-p tcp-dport PORT-j DROP" 2) or turn off the corresponding application, and the port shuts down naturally. For example: "kill-9 PID" (PID: process number) such as: through "netstat-anp | grep ssh", there is a display: tcp 0 127.0.1 PID 2121 0.0.0.0 anp * LISTEN 7546/ssh: "kill-9 7546"

The above is all the contents of the article "how to check the port you are listening to under Linux". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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