cbbackup/cbrestore doesn't handle external ip address

Error if external IP is used for backup. Only internal ip (10.188.1.49) works.

[root@ip-10-188-1-49 ~]# /opt/couchbase/bin/cbbackup http://test:password@ec2-184-169-209-27.us-west-1.compute.amazonaws.com:8091 ~/backup/backup-1 -u admin -p password
.
bucket: restore, msgs transferred...
: total | last | per sec
batch : 1 | 1 | 7.6
byte : 0 | 0 | 0.0
msg : 0 | 0 | 0.0
Traceback (most recent call last):
File "/opt/couchbase/lib/python/cbbackup", line 12, in <module>
sys.exit(pump_transfer.Backup().main(sys.argv))
File "/opt/couchbase/lib/python/pump_transfer.py", line 78, in main
sink_class, sink).run()
File "/opt/couchbase/lib/python/pump.py", line 125, in run
rv = self.transfer_bucket_design(source_bucket, source_map, sink_map)
File "/opt/couchbase/lib/python/pump.py", line 237, in transfer_bucket_design
source_bucket, source_map)
File "/opt/couchbase/lib/python/pump_tap.py", line 63, in provide_design
(spec_parts), None)
TypeError: not all arguments converted during string formatting