'Our channel request to the other side failed.  Payload::
uint32  local channel number
Get the C{Deferred} out of self.deferreds and errback it with a
C{error.ConchError}.'

def ssh_CHANNEL_FAILURE(self, packet):

    localChannel = struct.unpack('>L', packet[:4])[0]
    if self.deferreds.get(localChannel):
        d = self.deferreds[localChannel].pop(0)
        log.callWithLogger(self.channels[localChannel], d.errback, error.ConchError('channel    request    failed'))
