If you’re trying to login to a system as root and you haven’t done any configurations to allow this, you’re only going to be able to get in by using a normal user account. SSH is configured by default to deny root logins. Well, this is recommended in very very few situations, and sometimes you may want to just log in straight to root. When possible, you’re supposed to use an account with fewer permissions and only elevate to root when necessary. Root login if disabled and how to enable itįor security reasons, Linux almost never wants you to do anything as root by default. Running these commands should remedy the problem: $ chmod 700 ~/.ssh If using keys to authenticate (instead of a password) you’ll be locked out of the system entirely until you fix the permissions on your key files. Systemctl shows us that the SSH service is now running (press ‘q’ to exit this screen and return to the terminal). To check if it’s running, check the status again: $ sudo apt-get install openssh-serverĪfter the installation, the SSH service may start up automatically. You may have to use a slightly different command, depending on what distribution you’re using. We’re using Ubuntu in this example, so we’re going to use apt-get to install the openssh-server package. When checking on the status of the SSH daemon, the system informs us that the service could not be found. Let’s try checking on the status of the SSH service: $ systemctl status sshd This either means that the SSH server package isn’t installed on the system, or it could just mean that the service isn’t currently running. Here we get the dreaded “connection refused” error message. Trying to SSH into the localhost is a great way to see if your system is currently accepting connections. To check if your system has the SSH server installed, try initiating a remote connection to the system itself: $ ssh localhost You’ll see some output like the screenshot above if you have the SSH client installed on your system. To see if your SSH client is properly installed, just type “ssh” into the terminal. There is a client version of SSH (used for remoting into other systems) and a server version (used for accepting incoming connections into the system). The most basic troubleshooting you can do is to first verify that SSH is installed on the system. 11 Using ssh -vvv to debug SSH connection & check logs
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