Thanks for the info, the vendor made a SW upgrade to the latest versions and it helped to this situation.
However, there is a phenomena which I would like to understand; when my laptop is connected via WLAN and to the printer it is working fine. But when I connect my iphone with the cable it looses the connection. Laptop thinks it is connected via Ethernet (or at least the win10 icons claims so) and this causes the connection to be lost.
That is understandable because the physical media changes but when I disconnect the cable i.e. the WLAN comes back and Laptop uses WLAN agian the duet connection still doesn't recover. Thus the question is that what is the logic functionality behind the browser connection and is there a way to recover?
Browser refresh/restart does not help, only way to recover is to boot the laptop.