/etc/ssh/sshd_config

The /etc/ssh/sshd_config file is a configuration file for the OpenSSH server daemon (sshd). It contains various settings that determine the behavior of the sshd service, including:

- Port number: The TCP/IP port number on which the sshd service listens for incoming connections. The default is 22.
- Authentication methods: The authentication methods that are allowed for sshd connections, including password, public key, and keyboard interactive.
- PermitRootLogin: Whether or not the root user is allowed to log in via SSH. This is typically set to "no" for security reasons.
- Protocol version: The version of the SSH protocol that is allowed for incoming connections. The default is 2.
- HostKey: The location of the host key file used to identify the server to clients. This should be kept secure.
- AllowUsers/AllowGroups: A list of users or groups that are allowed to connect to the sshd service.
- X11Forwarding: Whether or not X11 forwarding is allowed for incoming connections.
- MaxAuthTries: The maximum number of authentication attempts that are allowed before the connection is terminated.

These are just a few examples of the many settings that can be configured in the /etc/ssh/sshd_config file. It is important to carefully review and configure these settings to ensure the security and proper functioning of the sshd service.