Judging from the following errors, you have to have the same password on both the source and destination clusters since you can only enter the password once on the command line:
$ /opt/couchbase/bin/cbtransfer --bucket-source=bucket1 --bucket-destination=bucket2 --username=Administrator --password=sourcepw --single-node http://localhost:8091 http://dest1:8091 error: unable to access REST API: dest1:8091/pools/default/buckets; please check source URL, username (-u) and password (-p) $ /opt/couchbase/bin/cbtransfer --bucket-source=bucket1 --bucket-destination=bucket2 --username=Administrator --password=destinationpw --single-node http://localhost:8091 http://dest1:8091 error: unable to access REST API: localhost:8091/pools/default/buckets; please check source URL, username (-u) and password (-p)
Am I missing something obvious?