Secure SHell (SSH) protocol 500 SSH user/group access controls. Directives are processed in this: deny-users, allow-users, deny-groups and allow-groups Login is allowed for users whose primary or supplementary group matches Login is allowed only for user names that match Login is disallowed for users whose primary or supplementary group matches Login is disallowed for user names that match Specifies allowed Ciphers Don't validate the remote host name with DNS Don't allow unknown user to login with password Specifies available KEX (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 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 Specifies available MAC (message authentication code) algorithms Port for SSH service 1-65535 Numeric IP port