Ubuntu modification settings series--the method of modifying the ssh port number (with examples)

Original website: Ubuntu modification settings series - method of modifying ssh port number (with examples)_IT sharp knife unsheathed blog-CSDN blog

Introduction

illustrate

This article introduces how to modify the ssh port number in Ubuntu (with examples).

goal to be achieved

ssh adds a port: 3333, and closes the original port 22.

1. Modify the port

Modify the configuration file /etc/ssh/sshd_config

sudo vi /etc/ssh/sshd_config

Add the following 2 lines at the end of the configuration file:

Port 22
Port 3333

Here port 22 has not been deleted for the time being to save the way, in case the new port cannot be connected but the default port is closed again, it will be troublesome.

2. Restart the SSH service

sudo service ssh restart

3. Test the new port

If you are prompted when you log in to SSH: no route to host, it should be that the firewall has not configured the corresponding port, just set the firewall.

4. Close port 22

 Modify the configuration file: /etc/ssh/sshd_config, close port 22 in the configuration file

# Port 22
Port 3333

5. Restart the SSH service

sudo service ssh restart