Where you have installed the Server? on a local net or on the cloud like Azure?, in case of Azure you need to configure the endpoint:
- Public and private port: 80
- Public and private port: 443
- Public and private port: 4244
- Public port: dynamic
- Private port: 3389
Make sure that you set the Firewall rules in Windows, allow ports 443 and 4244.
Maybe you can try changing the port from 80 to something else like 90; then, try this url, http:// [server]:90/hub, I understand you have added the server on the white list, use this instead of [server].
Hope this can help you!