[Solved] Www.starkhome.org: The server could not connect to the client to verify the domain

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My domain is:
I ran this command:
certbot --apache
It produced this output:
Failed authorization procedure. www.starkhome.org (http-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Fetching http://www.starkhome.org/.well-known/acme-challenge/uyROcCyKRsS7PjsNuUFys6M9_xkUcVSlmf7BYFqVAG8: Timeout
My web server is (include version):
Apache/2.4.18 (Ubuntu)
The operating system my web server runs on is (include version):
Ubuntu 16.04
My hosting provider, if applicable, is:
I can login to a root shell on my machine (yes or no, or I don’t know):
I’m using a control panel to manage my site (no, or provide the name and version of the control panel)no

www.starkhome.org.          (unsigned)  3524  CNAME  jasonstark916.synology.me.
jasonstark916.synology.me.  (unsigned)  164   A
jasonstark916.synology.me.  (unsigned)  165   AAAA   2601:84:c801:5162:211:32ff:fe5b:5477

Connecting to http://www.starkhome.org/ over IPv6 times out, though IPv4 works.

Are you sure the IPv6 address is correct, doesn’t block port 80 in a firewall, and works?

I’m not sure whether IPv6 works. I don’t know how to test it. Happy to give it a try, though.

I edited my DNS entries, and replaced the DDNS addresses (jasonstark916.synology.me) with IPv4 addresses ( Entering the IPv4 address into a browser returns my index.html web page.

I also added an AAAA entry for 2601:84:c801:5162:211:32ff:fe5b:5477. It times out if I enter it into a browser.

I’m set up in a home network. I have been using a Synology NAS, set up with web server. I’m replacing with Ubuntu 16.04 server, and working out the installation using a VirtualBox (v 5.2.8) VM running on a Mac OS X host (v 10.13.4). The index.html page that I serve at is coming from the Ubuntu guest on that VM.

I have my router set up so that port 80 forwards to port 80, and port 443 forwards to port 443.

Your IPv6 connectivity is currently broken. You should debug that (maybe with some help from your ISP) or else remove the AAAA record.

If I were to remove the AAAA record, should I expect to be successful to obtain certificates using IPv4? Thank you for your help!

I removed the AAAA record, and ran “certbot --apache”. This was successful. Thank you for your help. You guys (and EFF) provide a great service.

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