The most likely reason is that no SSH server is running on the target computer. Another reason may be that the SSH server was placed on a non-standard port as a safety precaution.
Usually it'll be kept in ~/.ssh/known_hosts. When you change operating systems or reinstall SSH daemons on machines you have access to, it is often a good idea to delete this file or your client may refuse to connect because it thinks something fishy is going on.
Typically it would be a hidden folder called ".ssh".
SSH is extremely simple. Using the SSH client, you connect to the computer running the SSH server using the commandssh [ip address or hostname here]
An SSH Keygen is used to generate, manage, and convert authentication keys for SSH authentication. With an SSH Keygen tool, a user can create passphrase keys for both SSH protocol version 1 and 2.
/etc/ssh/sshd_config In some distributions it can be in odd places like /etc/sshd_config, /usr/local/etc/ssh/sshd_config
ssh
Most Linux distributions will come with SSH preinstalled. If it's not, install the package "ssh".
It is usually referred to simply as "SSH."
To set up SSH with DSA/RSA public key authentication, you need to generate a key pair on the client machine using a command like ssh-keygen. Then, copy the public key to the server's ~/.ssh/authorized_keys file. Finally, make sure the permissions on the ~/.ssh/ directory and the authorized_keys file are secure (e.g., chmod 700 ~/.ssh and chmod 600 ~/.ssh/authorized_keys).
I assume you mean the user's ssh directory, which is stored in their home directory. Use the following command: rm -rf .ssh This will remove any previously used and verified ssh connections so any connections after that via ssh will need to be verified.
The well-known traditional port for ssh is port 22.
sshd is the package provide ssh sessions .