conn = new Mongo("10.171.0.39:27017")  // You need to change hostname and port name according to your second instance.
db = conn.getDB("local")  // Specify name of your database.
show collections 

This command will list out  all collections in another instance.

Now open a MongoJS window, and execute above script in same order.

You will observe when we execute show collection command, ADS only list collections of your current instance and not of the one you specified in connectionstring. 

Reference Link:

Actual result:
Using MongoJS we are not able to connect to a mongodatabase server running at different location.

Expected  Result:
Using MongoJS we should also be able to connect to a server instance running on different location.