Client side timeout exception

[grepollo]

Hi i've been trying to google for an answer to my problem, but I had no luck.

I have setup the CB server on AWS EC ubuntu, it is working since i can play around with it on the said machine, but when i try to connect on my local server, it is always showing timeout exception:

I've tried what the documentation said:
1)

$cc = new \CouchbaseCluster('http://mydomain.com', 'user', 'password')

-> not working
using IP
2)

$cc = new \CouchbaseCluster('couchbase://52.16.45.7', 'user', 'password')

-> not working
using with port

8091

on each one, still not working but using '

couchbase://localhost

' will work only if i execute the query within the server.

Any idea what i've done wrong? thanks.