Now it seems the issue is solved.
First I cheched the firewall rules, but I only found both rules for Zulu Platform, but nothing for openHAB with ports 8080 and 8443. How they was created on your system ?
Changing the Zulu rules activating for all 3 profiles was not the solution.
But regarding to your hint to change the local scurity settings (with “secpol.msc”) and here especially under “Network List Manager Policies” the points “Undefined Networks” and “Identifying Networks” solved it.
I changed both from Location Type “Not configured” to “privat” and thats all.
Thus, perhaps this is a point to integrate into the tutorial/documentation in case of the windows machine is a domain computer. Of cause most of all using windows without a domain, but other someone can investigate many time to find a solution (like me), which really is simple.
Thanx for your support.