Error getting validation data


I have a subdomain: that points to an ip address. When trying to get an SSL certificate, I get this:

   Type:   connection
   Detail: Fetching
   Error getting validation data

   To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A/AAAA record(s) for that domain
   contain(s) the right IP address. Additionally, please check that
   your computer has a publicly routable IP address and that no
   firewalls are preventing the server from communicating with the
   client. If you're using the webroot plugin, you should also verify
   that you are serving files from the webroot path you provided. has an SSL certificate from letsencrypt. is pointed from’s DNS.

But doesn’t have an IP address. Not A nor AAAA. The www subdomain does however, which resolves to

But it resolves to There isn’t anything listening on port 80 on that IP address. Did you use an existing and running webserver? Or did you use the standalone plugin? It’s unfortunate you didn’t fill in the template questionnaire which should have been presented to you when you started this thread in the Help category.

Sorry, there is not a webserver on port 80. Though I have Home Assistant listening on port 8123. And does have a DNS A record to

You can use the standalone plugin to spin op a temporarily webserver (some kind of Python module providing that…) to get your hostname authorised.

Well, I’ve tried all of the authoritive name servers for (,,, and but none of them has an A record for

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