Secure SHell (SSH) protocol 500 SSH user/group access controls. Directives are processed in this: deny-users, allow-users, deny-groups and allow-groups Configure sshd_config access control for allowed groups Configure sshd_config access control for allowed users Configure sshd_config access control for disallowed groups Configure sshd_config access control for disallowed users Enable root login over ssh Allowed ciphers Don't validate the remote host name with DNS Don't allow unknown user to login with password Key exchange algorithms Local addresses SSH service should listen on ipv4 IP address to listen for incoming connections ipv6 IPv6 address to listen for incoming connections ipv4,ipv6 Log level QUIET stay silent FATAL log fatals only ERROR log errors and fatals only INFO default log level VERBOSE enable logging of failed login attempts Allowed message authentication algorithms Port for SSH service u32:1-65535 Numeric IP port u32