Also, yesterday I helped someone to install XAMPP on his PC (not in my lan) and... I discovered that NOW I have some problem, an example web site on my pc is not reachable and when I try to access it, simply using a browser and
HTTP://[MyRouterIP] /FolderSite... the "router administration home page" is shown!
I think this is a different problem, because the b4j websocket server is reachable on his port. Apache is as usual listening on ports 80 and 443 and I have disabled my firewalls (also the firewall of the router).