Cant publish html5 portal via azure app proxy.

I tried a lot, but Im not able to publish my html5 Portal via azure app Proxy. Other Portals where easy to publish.
Question:
1) Is it Possible to Do this?
2) Is a tutorial available?
3) Any Tipps, todo this?

 

I too would love to know all three questions previously posted.
We have used Azure App Proxy for a number of other internal on-premises sites to facilitate access externally without the need for a traditional VPN.
When attempting to launch applications after succesfully logging into HTML5 through azure app proxy can see a heap of requests but after a while eventually get the [0x0204] error.