Remote connection via ODBC

Downloaded and installed the cdata Couchbase ODBC driver, but I cannot connect to our cluster.

EH WARNING: odbc_exec(): SQL error: Connection failed: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 172.xxx.xxx.xxx:8091, SQL state HY000 in SQLExecDirect in test.php

Are remote connections to Couchbase not supported even under this context?
If so, how do we allow remote connections?
Thanks in advance.