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  • Click on the Defender icon and then on the Firewall section and report on the warning message.
    – harrymc
    Commented May 14, 2018 at 14:36
  • Click on the Defender icon: OK, opens "Windows Defender Security Center" Then on the Firewall section: impossible, since that place is already occupied by the warning "Die Windows Defender Firewall verwendet Einstellungen, die Ihr Gerät gefährden könnten" (the windows defender firewall uses settings that could harm your device - or so). Below that is a button "Einstellungen wiederherstellen" (restore settings), which, when applied, wipe all rules completely back to their defaults (snake oil settings). Commented May 14, 2018 at 14:55
  • P.S.: Under "Systemsteuerung\Alle Systemsteuerungselemente\Sicherheit und Wartung", it tells me the firewall being completely switched off. What is completely wrong. I have no clou about which action triggered this level of wrongfulness in this system. Commented May 14, 2018 at 15:08
  • How did you restrict the firewall to whitelisting?
    – harrymc
    Commented May 14, 2018 at 15:16
  • That was the setting of "outgoing" connections to "blocked". After that, only registered exceptions are allowed to telephone out. Thanks for helping with experimenting by the way: In the long run, it triggered me to look at the right place (see "solution" answer). Commented May 14, 2018 at 15:26