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 IMPORTANT NOTES: - The following errors were reported by the server: Domain: dev.daanwielens.com Type: connection Detail: Fetching http://dev.daanwielens.com/.well-known/acme-challenge/LPLR4TRaUr9SeKTCrPhpKvth7vtanZntd561y1jr_Dc: Timeout 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!