Specifies a file from which a host key is read. If the client fails to authenticate the user within this many seconds, the Gives the grace time for clients to authenticate themselves (default 120 seconds). sshd refuses to start if there is no configuration file. Specifies the name of the configuration file. e' When this option is specified, sshd will send the output to the standard error instead of the system log. Multiple -d options increase the debugging level. This option is only intended for debugging for the server. The server sends verbose debug output to the system log, and does not put itself in the background. D' When this option is specified, sshd will not detach and does not become a daemon. All are required and may be supplied in any order, either with multiple -C The keywords are ''user'', ''host'', and ''addr''. The connection parameters are supplied as If provided, any Match directives in the configuration file that wouldДЄpply to the specified user, host, and address will be set before the configuration is written to standard output. Specify the connection parameters to use for the -T extended test mode. Specifies the number of bits in the ephemeral protocol version 1 server key (default 1024). 6' Forces sshd to use IPv6 addresses only. 4' Forces sshd to use IPv4 addresses only. sshd rereads its configuration file when it receives a hangup signal, SIGHUP, by executing itself with the name and options Sshd can be configured using command-line options or a configuration file (by default sshd_config(5)) command-line options override values specified

The forked daemons handle key exchange, encryption, authentication, command execution, and data exchange. It forks a new daemon for each incoming connection. It is normally started at boot from /etc/rc. Sshd listens for connections from clients. Together these programs replace rlogin(1) and rsh(1), and provide secure encryptedД¬ommunications between two untrusted hosts over an insecure network. Sshd (OpenSSH Daemon) is the daemon program for ssh(1).

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