[memcached] failed to listen on UDP port 11211
Address book server is failing with the above error....
and this...
2014-08-15 11:18:54+0100 [-] [carddav-8801] [Uninitialized] [twistedcaldav.memcachepool.MemCacheClientFactory#error] MemCache connection failed: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectError'>: An error occurred while connecting: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionLost'>: Connection to the other side was lost in a non-clean fashion.
2014-08-15 11:18:54+0100 [-] [carddav-8801] ].
2014-08-15 11:18:54+0100 [-] [carddav-8801] ]
2014-08-15 11:19:00+0100 [-] [carddav-8801] [Uninitialized] [twistedcaldav.memcachepool.MemCacheClientFactory#error] MemCache connection failed: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionRefusedError'>: Connection was refused by other side: 61: Connection refused.