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Check to see if the server's SSH service is operational. Using commands like ‘sudo systemctl status sshd’ or ‘sudo service ssh status,’ you can look into this by attempting to restart the SSH service.
To make sure the SSH port is open, check the firewall settings. You can enable the SSH port if your firewall is like Ubuntu's UFW (Uncomplicated Firewall) by running 'sudo ufw allow ssh'.
Look for any errors in the "sshd_config" file, which contains the SSH server setup. Verify if the person you are attempting to connect with has permission to SSH into the server.
Make sure the IP address of the remote server you are trying to connect is not changed. Update your SSH configuration or DNS records accordingly.
Connection refused errors can sometimes be caused by network issues. Make sure that there is no network connectivity issue between your local machine and the server.