Certbot Failed to Authenticate some Domains

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Sorry to interrupt but how does that nginx server with listen 80; receive IPv6 requests? I am not suggesting it is wrong, I just honestly don't know.

Current requests from IPv4 and 6 seem to work. In the first post the error message is for IPv6 request. I just don't understand how it can with the listen clause as it is. Thanks

NB: I agree with 9peppe that the change to that location should not have mattered. The original format is exactly what I use on my own server.

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You can forward the hosts IPv6 via docker to IPv4 in your container, could be that (maybe that's the default?).

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