Certbot fails to verify my domain, but I can access the challenge


My domain is: comments.leotindall.com

I ran this command: certbot and certbot --manual --installer nginx

It produced this output:

My web server is (include version): nginx/1.14.0 (Ubuntu)

The operating system my web server runs on is (include version): Ubuntu 18.04.1

My hosting provider, if applicable, is: linode

I can login to a root shell on my machine (yes or no, or I don’t know): yes

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): no

The verification process fails with a 404 error despite the fact that I can access the file it’s looking for perfectly fine from a browser or from the command line. This happens consistently and I keep getting rate limited trying to fix it. I’ve used Certbot to issue certs from this same machine for leotindall.com, vid.leotindall.com, pad.leotindall.com, and several more.


You were able to wget the file over IPv4, but does IPv6 work too?

I haven’t tried the challenge URL, but http://comments.leotindall.com/ itself returns a 404 Not Found error when accessed over IPv6 and a “Home | Leo Tindall” page when accessed over IPv4.

Check Nginx’s listen and server_name directives.


This does seem to have been the problem, thank you!


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