That server's admin can confirm the expected fingerprint using this command on the server: $ sudo ssh-keygen -v -lf \ The fingerprint is derived from an SSH key located in the /etc/ssh directory on the remote server. If you installed and configured the system, you may (or may not) have a record of its fingerprint, but otherwise, you probably have no way to confirm whether the fingerprint is valid. The fingerprint is a unique identifier for the system you're logging into. To access a server with IP 10.200.1.3 from another Linux system, the syntax is: ssh example, to log in as the user tux to a server located at 10.200.1.3: $ ssh instances where SSH runs on a different port, say 2345, specify the port number with the -p option: $ ssh -p 2345 first time you connect to a remote server, you're prompted to confirm the system's identity: $ ssh authenticity of host '10.200.1.3 (10.200.1.3)' can't be established.ĮD25519 key fingerprint is SHA256:55ZkHA/4KU7M9B3je9uj8+oOLjFdV0xHxPTjMvCT0hE.Īre you sure you want to continue connecting (yes/no/)? You can now initiate a connection to the server using the IP or the hostname. If not, you can install the client on a RHEL system using your package manager: $ sudo dnf install -y openssh-clients Most Linux and macOS systems have the openssh-clients package installed by default. You can then access the server with most terminal applications that support the SSH protocol (GNOME Terminal, Konsole, PuTTY, mobaxterm, and others). If it's not present, install OpenSSH on a RHEL server using your package manager, and then start and enable it using systemctl: $ sudo dnf install openssh-server OpenSSH is usually installed by default on Linux servers. This process encrypts traffic exchanged between the server and the client. Because passwords and usernames can be brute-forced, it's recommended to use SSH keys.įor an SSH client and server to establish a connection, the SSH server sends the client a copy of its public key before allowing the client to log in. You can connect using a password or a private and public key pair. To initiate an SSH connection to a remote system, you need the Internet Protocol (IP) address or hostname of the remote server and a valid username. SSH uses port 22 by default, but you can change this to a different port. The sshd daemon, which runs on the remote server, accepts connections from clients on a TCP port. The OpenSSH suite contains tools such as sshd, scp, sftp, and others that encrypt all traffic between your local host and a remote server.
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