Timeout on ACME challenge



I installed the Certbot for Apache / Debian Stretch on a Raspberry Pi 3. To obtain a certificate, I ran

$ sudo certbot --authenticator webroot --installer apache

The script is correctly producing the challenge files (I verified this with a different tty session), but is giving the following error:

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer apache
No names were found in your configuration files. Please enter in your domain
name(s) (comma and/or space separated)  (Enter 'c' to cancel): dev.daanwielens.com
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for dev.daanwielens.com
Input the webroot for dev.daanwielens.com: (Enter 'c' to cancel): /var/www/html
Waiting for verification...
Cleaning up challenges
Failed authorization procedure. dev.daanwielens.com (http-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Fetching http://dev.daanwielens.com/.well-known/acme-challenge/LPLR4TRaUr9SeKTCrPhpKvth7vtanZntd561y1jr_Dc: Timeout

 - The following errors were reported by the server:

   Domain: dev.daanwielens.com
   Type:   connection
   Detail: Fetching

   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.

I am aware of the fact that the acme-challenge files are removed after a trial, so I created a simple test file in the acme-challenge folder. This file is readable from the web (http://dev.daanwielens.com/.well-known/acme-challenge/test).

I have not made any changes to my Apache’s vHost configuration file. My webroot is not protected by any .htaccess file or any other mechanism.

Does anyone have an idea what causes the certbot to timeout? Thanks in advance!


You have an AAAA record but your server isn’t responding on IPv6.


Thanks, I forgot that I once set that up for testing purposes. Removed the AAAA record and now the installation succeeded.


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