Getting "endpoint not available"

I have zenoss latest version installed for the testing. It's running on docker engine 1.12.1.

Webbrowser is up and I can see Applications , Resource pools etc. I want to use the json api and I guess CentralQuery is what I need. But, I can't get that to work. I added public endpoint with port but I keep getting 'endpoint not available'. I tried other combinations and other public endpoints changes too (with port) but I just get that error. With netstat I see that the ports are bound correctly as soon as I add a new public endpoint from web interface.

This is my public hosted endpointhttps://34.195.235.211 (ccuser/ccuser)