@teivah: Could you please share more details about your setup? How many hosts do you have? Are the two containers you mentioned belong to the same application? Are the two containers running on the same host or different ones? If you have your images on docker hub, can you please share details on how I can reproduce the issue at my end?
I just launched two different stacks on my cluster. I selected “Mananged” for network settings. And I am able to use the Rancher IP address and connect to the service running inside the container.