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This article mainly explains "how Linu modifies SSH port number". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to modify SSH port number by Linu".

Tools / raw materials

Linux system of remote tools such as Xshell putty

What is SSH?

SSH is Secure Shell

Developed by IETF's Network working Group (Network Working Group)

SSH is a security protocol based on application layer and transport layer.

SSH transmission data is encrypted, which can effectively prevent the transmission process from being intercepted to ensure security.

SSH data is compressed, so it can speed up the transmission.

View SSH services

First check whether the SSH package is installed in linux, and use rpm-qa | grep ssh

two。 Confirm that the ssh service is enabled. The following editor takes the centos system as an example.

3. The path to the SSh service configuration file is usually found in the / etc/ssh directory, sshd_config this file.

END

Edit and modify SSH port number

1. Using the VI\ vim editor, open the file sshd_config and search to find the port field. The figure below is as follows

2 position the cursor over the line port 22 yy and then the keyboard P copy a line, insert insert edit port 22 is 2222

3 after setting up, as shown in the following figure, wq saves and exits, indicating that a 2222 port number has been added.

4. Once set up, of course, you need to restart the SSH service.

5. If you have set up a firewall, please modify the rules to add the firewall, or turn off the firewall directly

END

Matters needing attention

The default SSH port is 22. If you want to edit port 22 directly, please remove the "#" in front of it, and then save and restart.

If you are adding a port number, just follow the editor's method and add a port port.

Thank you for reading, the above is the content of "how Linu modifies SSH port number". After the study of this article, I believe you have a deeper understanding of how Linu modifies SSH port number, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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