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Add a parallel step there, somewhere, for DNS. My raspberry pi runs pihole but the hardware is failing somehow so the server crashes so DNS lookups fail. All existing connections are fine, direct IPs are fine, locally cached results are fine, but new lookups fail. It is somewhat fun to watch it happen.

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Windows has a tool to diagnose network problems, and it's usually completely useless but I think DNS not working is something it does identify.

Windows has a button to diagnose failed internet connections, but it has never reported anything other that the internet connection doesn't work. It's pathetic.

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Try: ISP router intercepts DNS and drops the record because your company put private addresses on public DNS and the router has rebind protection.

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