I set up my RasPi 4 as a WiFi Access Point according to this guide, and it worked - I could see the SSID in the list of networks, and join the WiFi network, and connect using ssh, but only for a brief, 10-minute period.

My ssh connection froze and I had to terminate the session and now the SSID is not showing up in my list of networks on any of my devices.

Not quite sure how to begin to debug this.

  • sudo systemctl status for both hostapd and dnsmasq shows that they are active (running), although I just noticed that warning: interface wlan0 does not currently exist returns from sudo systemctl status dnsmasq. I will investigate further – Thomas Capogreco Dec 10 '19 at 13:59
  • Have you tried rebooting the RPI? – LegendusMaximus Dec 20 '19 at 8:56

ok - so the trick was to unhash allow-hotplug wlan0 in /etc/network/interfaces.

solution came from here.

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  • hmmm ok - nope. this is not the solution - SSID disappeared again. still looking for a solution – Thomas Capogreco Dec 10 '19 at 14:54

I think the real culprit was that the inbuilt WiFi adaptor was too weak. I've set it up to use a USB WiFi dongle, and it seems to be working well now.

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    Please don't create always a new answer. Instead edit your first answer and modify it. There is a link below the answer, named edit. And please accept your own answer with a click on the tick on its left side. Only this will finish the question and it will not pop up again months for months. – Ingo Dec 13 '19 at 21:13

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