Cannot connect to replica set

Hi @Pavel_Duchovny,

The ip addresses in my rs.conf() are IP’s of the internal private cloud subnet.
I cannot try to connect to them from outside the network.

I tried following things:
Both MongoDB Compass and Robo 3T.
In both I tried by entering a connection string with all nodes of the replicaset (primary, secondary and arbiter), a connection string with primary and secondary and the fill in form to connect to one node separately.

Are there any other things I need to consider to make the replicaset available through an internet gateway ?
I binded port 27017 to both the private ip and localhost ip of my instances.

When I create a connection string do I also add the arbiter node to the string or only primary and secondary ?

I am using MongoDB 4.2 btw.

Thanks for the help !