<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _force_close(self):
 """Close connection without QUIT message"""

        if self._sock:
            try:
                self._sock.close()
            except:  # noqa
                pass
        self._sock = None
        self._rfile = None