What's the IP of the http-01 challenge?



We're trying to install the free buypass SSL certificate using certbot on a server behind a firewall.


We whitelisted buypass.com, and I was able to register the server, but I got this error message. That question is posted a month ago. The OP says that the http-01 challenge IPs have changed


This question, from 11 months ago, says to whitelist


IPv6: 2a03:520::/29


should we whitelist those IPs or different ones?

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