== before the cut 02:57:07
dns: 192.168.0.154  app name: 192.168.0.148  other: 104.20.23.154
dashboard by name through the box's own DNS answer: 000
the same at the guest's address: 302
== during the cut 02:57:48
dns: 192.168.0.154  app name: 192.168.0.148  other: 104.20.23.154
dashboard by name through the box's own DNS answer: 000
the same at the guest's address: 302
== demo-hp, for the host-FQDN comparison 02:58:24
box DNS answers: 192.168.0.155 192.168.0.158 
dashboard by name at the first answer: 302
Tester 1: /etc/hosts holds 192.168.0.154 felhom.enkicsifelhom.hu (the host's FQDN is the dashboard's name); dnsmasq reads /etc/hosts first, so the dashboard's name answers the HOST, where nothing serves 443.
