Can not connect with android browser

Openhabianpi:8080 reacheable with laptop/pc firefox/chrome.

Openhab reachable with openhab app on android.

openhabianpi NOT reachable with android browser , not firefox nor chrome.

were lays the problem ?

I getting the same behavior since a while “websocket error” on android devices.
Even after fresh install.
I wonder if nobody else has it?
Unfortunately I found no explanation or way around.

io.socket.engineio.client.EngineIOException: websocket error
	at io.socket.engineio.client.Transport.onError(Transport.java:71) [191:org.openhab.io.openhabcloud:2.2.0.201711152010]
	at io.socket.engineio.client.transports.WebSocket.access$500(WebSocket.java:28) [191:org.openhab.io.openhabcloud:2.2.0.201711152010]
	at io.socket.engineio.client.transports.WebSocket$2$5.run(WebSocket.java:150) [191:org.openhab.io.openhabcloud:2.2.0.201711152010]
	at io.socket.thread.EventThread$2.run(EventThread.java:80) [191:org.openhab.io.openhabcloud:2.2.0.201711152010]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
	at java.lang.Thread.run(Thread.java:748) [?:?]

Observing no problems by displaying my BasicUI on Chrome on my Android Smartphone.
Using OH2.1 stable release.
What version are you observing this?