Hello,
Know that it has been awhile since you posted this question but curious on if you have resolved the issue and the solution.
I am not able to reproduce what you described but wondering which rpm version did you use to install Sync Gateway?
Presuming the Couchbase Server running, then which port is the Sync Gateway on?
Also, did you include or modify the config.JSON file for the Sync Gateway as this is required.
http://docs.couchbase.com/sync-gateway/#configuration-files