PermitRootLogin
PermitRootLogin

Specifies whether the root can log in using ssh(1). The argument must be ``yes'', ``without-password'' or ``no''. The default is ``yes''. If this options is set to ``without-password'' only password authentication is disabled for root. Root login with RSA authentication when the command option has been specified will be allowed regardless of the value of this setting (which may be useful for taking remote backups even if root login is normally not allowed).