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( []
	at io.socket.engineio.client.transports.WebSocket.access$500( []
	at io.socket.engineio.client.transports.WebSocket$2$ []
	at io.socket.thread.EventThread$ []
	at java.util.concurrent.ThreadPoolExecutor.runWorker( [?:?]
	at java.util.concurrent.ThreadPoolExecutor$ [?:?]
	at [?:?]

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