mongodb replicaset connection error - mongodb

Question

I am getting connection errors, when I try to connect to my replica set either in PHP code or in the mongo shell.
1. PHP
This is the php code trying to make the connection:
$manager = new MongoDB\Driver\Manager("mongodb://remoteServerIp:27017/".$db."?replicaSet=rs0");
and the connection result is this error:
No suitable servers found (`serverSelectionTryOnce` set):
[connection timeout calling ismaster on '10.10.0.16:27017']
[connection timeout calling ismaster on '10.10.0.17:27017']
[connection timeout calling ismaster on '10.10.0.15:27017']
2. mongo shell
If I try this command to connect in the mongo shell:
shell> mongo -host "rs0/remoteServerIp"
... the result is this error:
MongoDB shell version: 3.2.10 connecting to: rs0/remoteServerIp:27017/test
2016-12-28T02:19:02.216+0000 I NETWORK [thread1] Starting new replica set monitor for rs0/xxx.xxx.xxx.xxx:27017
2016-12-28T02:19:02.216+0000 I NETWORK [ReplicaSetMonitorWatcher] starting
2016-12-28T02:19:07.216+0000 W NETWORK [thread1] Failed to connect to xxx.xxx.xxx.xxx:27017, reason: errno:115 Operation now in progress
2016-12-28T02:19:07.216+0000 W NETWORK [thread1] No primary detected for set rs0
2016-12-28T02:19:12.716+0000 W NETWORK [thread1] Failed to connect to xxx.xxx.xxx.xxx:27017, reason: errno:115 Operation now in progress
2016-12-28T02:19:12.716+0000 W NETWORK [thread1] No primary detected for set rs0
2016-12-28T02:19:18.216+0000 W NETWORK [thread1] Failed to connect to xxx.xxx.xxx.xxx:27017, reason: errno:115 Operation now in progress
2016-12-28T02:19:18.216+0000 W NETWORK [thread1] No primary detected for set rs0
2016-12-28T02:19:18.216+0000 E QUERY [thread1] Error: connect failed to replica set rs0/xxx.xxx.xxx.xxx:27017 : connect#src/mongo/shell/mongo.js:231:14 #(connect):1:6
3. mongo shell (private ip address)
By contrast, this connection attempt succeeds:
shell> mongo -host "rs0/privateip(10.10.0.16)"
How can I connect to mongo server with replicaset ?