# Now lets read the response from the command channel.
        my $read = sysread( $self, $data, 4096);
        unless( $read ) {
          # Not called as an object member in case $self not a FTPSSL obj.
          _croak_or_return ($self, 0, (defined $read)
                                ? "Can't read command channel socket: $!"
                                : "Unexpected EOF on command channel socket!");
          return (CMD_ERROR);
        }
     }