def ssh_REQUEST_FAILURE(self, packet):
        """
        Our global request failed.  Get the appropriate Deferred and errback
        it with the packet we received.
        """
        log.msg('RF')
        self.deferreds['global'].pop(0).errback(
            error.ConchError('global request failed', packet))

        Our global request failed.  Get the appropriate Deferred and errback
        it with the packet we received.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/ssh/connection.py