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SSH default login port number is 22, but because the port number everyone knows, it is not safe.
Modify the connection port
vim /etc/ssh/sshd_config
Execute the following command to enter the directory ssh, ssh restart the service
systemctl restart sshd.serviceIf you need here is a cloud server security group to open it, you just set the port to open it.
https://blog.csdn.net/Tomwildboar/article/details/89295799
