The key symbol is shown by Android, so you might have disabled some Android notifications causing this notification to disappear too.
NetGuard tried to connect to a remote server via a Linux socket and got "no route to host" back. This can have a number of causes, but this is not caused and cannot be fixed by NetGuard.
Possible causes are that there is another, external firewall blocking connections or that the host is not responding (in time).
SO_ERROR 113: No route to host
The destination host cannot be reached (probably because the host is down or a remote router cannot reach it).
Thanks for Netguard. It is a very intuitive and useful software.
My question/suggestion is could you add the app/service DNS over TLS uses or Netguard shows to the FAQ item 64 as it isn't overly apparent and if the choice of blocking everything by default is selected, then it is obviously blocked.
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