Fix SSH Connection Error: Linux Server Guide

If unable to connect to a Linux server remotely via SSH, there could be multiple reasons, and the following methods can be tried to troubleshoot the issue:

1. Make sure the SSH service of the server is running properly: You can log in to the server’s console or physically access the server, then run “sudo service ssh status” in the local terminal to check the status of the SSH service. If the service is not started, you can run “sudo service ssh start” to start the service.
2. Check the server firewall settings: If the server has a firewall enabled, it may be blocking SSH connections. You can try temporarily disabling the firewall or adjusting the firewall rules to allow SSH connections.
3. Check the SSH configuration file: You can log in to the server console or view the SSH configuration file /etc/ssh/sshd_config through other means to ensure that the SSH service port is correctly configured, usually the default port is 22. Also, check if password login is allowed or if SSH key login is configured.
4. Check the network connection: make sure the local network connection is working properly, try to connect using other devices or networks to rule out local network issues.
5. Check SSH client configuration to ensure that the local SSH client configuration is correct, such as the username, password, or key file.

If the above methods do not solve the problem, you can try restarting the server or contact the server administrator for further troubleshooting.