CentOS 7 SSH Connection Fix: Troubleshooting Guide

1 year ago
Sophia Anderson
2 minutes

To resolve the issue of unable to connect remotely via SSH on CentOS 7, you can try the following methods:

  1. Make sure that the SSH service has been correctly installed and is running. You can check the status of the SSH service using the following command:
systemctl status sshd

If the SSH service is not running, you can start the SSH service using the following command:

systemctl start sshd
  1. Check the firewall settings to make sure the SSH service port (usually 22) is open. You can use the following command to view the firewall status:
firewall-cmd --list-all

If the SSH service port is not open, you can use the following command to add the SSH service port to the firewall rules:

firewall-cmd --add-port=22/tcp --permanent

Then restart the firewall to apply the settings.

firewall-cmd --reload
  1. Check the SSH configuration file (/etc/ssh/sshd_config) to see if remote connections are allowed. Make sure the following settings are not commented out or set to “yes”:
PermitRootLogin yes
PasswordAuthentication yes

Don’t forget to restart the SSH service after modifying the configuration file for the changes to take effect.

systemctl restart sshd
  1. If you are still unable to connect, you can try using a different SSH client or enable SSH debug mode to view detailed error information.
ssh -vvv user@remote_host

By following the above method, you should be able to troubleshoot the issue of unable to connect to CentOS 7 remotely via SSH. If the problem persists, you can try reinstalling the SSH service or checking if the network connection is functioning properly.

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