To restart OpenSSH server on Debian 7, Ubuntu 14.10 or earlier: $ sudo /etc/init. To restart OpenSSH server on Debian 8, Ubuntu 15.04 or later: $ sudo systemctl restart ssh Once you have modified /etc/ssh/sshd_config, make sure to restart SSH service. You can specify multiple users separated by space. Using the AllowUsers option, you can selectively disable SSH service for particular Linux users. The PermitRootLogin option tells whether root can log in to the system via SSH. If for any reason, the host key got corrupted, you need to re-generate it. The HostKey option specifies where the private host key is located. This option helps improve security by limiting incoming SSH connections via a specific interface only. If your machine has more than one physical network interface, and you would like to specify the interface on which sshd binds, you can use the ListenAddress option. By changing the default SSH port, you may be able to avert various automated attacks from hackers. There are a couple of OpenSSH options you may be interested in: Port 22īy default, sshd listens on port 22 to listen for incoming SSH connections. If you would like to configure OpenSSH server, you can edit the system-wide OpenSSH configuration file /etc/ssh/sshd_config. To auto-start OpenSSH server on Ubuntu 15.04 and Debian 8.0 or later: $ sudo systemctl enable sshįor Fedora and CentOS/RHEL 7 or Later: $ sudo yum -y install openssh-server openssh-clientsįor CentOS/RHEL 6 or Earlier: $ sudo yum -y install openssh-server openssh-clientsįor Arch Linux: $ sudo pacman -Sy openssh To auto-start OpenSSH server on Ubuntu 14.10 and Debian 7.0 or earlier: $ sudo update-rc.d ssh defaults If for any reason OpenSSH server does not get started automatically upon boot, you can run the following command to explicitly add SSH to boot time service. On Debian-based systems, once OpenSSH server is installed, OpenSSH server will start automatically upon boot. For Debian, Ubuntu or Linux Mint: $ sudo apt-get install openssh-server openssh-client If you want to install OpenSSH server/client, and auto-start OpenSSH server, follow these distro-specfic instructions. Install OpenSSH Server and Client on Linux
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