Error when installing SSL

Hi! I’ve installed Let’s Encrypt and used it with different domains. Always successfull. Now I get an error and I can’t find how to solve it. I’ve viewed several forums… The error I’m getting is:

Error: Let’s Encrypt SSL certificate installation failed: Challenge marked as invalid. Details: Invalid response from [2a03:3c00:a002:177::1000]: 404

Does anybody have any idea how to solve this?

Like to hear from you!


Hi @itsomimedia,

Your domain has 2 ips, 1 for IPv4 and 1 for IPv6. The IPv4 points to a nginx server and the IPv6 to an apache server.

If you don’t use the IPv6, remove the AAAA record from your dns servers and try again.


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