{{tag>certbot letsencrypt ssl troubleshooting}}

====== Letsencrypt certbot troubleshooting ======
  * certbot first establishes connection over ipv6. If you are getting timeout errors check firewall for ipv6 https access or set network stack to prefer ipv4 over ipv6

  * Make sure that you can access a file path under webserver root as certbot uses .well-acme folder inside it to fetch the token it uses to check the owner of domain/server
    
  * If there is a previous redirect in webserver configuration it could also interfere with certificate generation

  * Certbot only works on default ports, 80 and 443. Check if the Listen directive has a different port if you get "Unauthorized error.

  * When using the [[https://docs.ansible.com/ansible/latest/collections/community/crypto/acme_certificate_module.html#examples|ansible module]] make sure you add a [[https://github.com/ansible-collections/community.crypto/pull/11/files|check]] for the //challenge_data// this part:

  when: sample_com_challenge is changed and 'sample.com' in sample_com_challenge['challenge_data']

otherwise the step will fail with this error
<code>
TASK [letsencrypt : Implement http-01 challenge files] ***********************************************************************************************************
fatal: [1.1.1.1]: FAILED! => 
  msg: |-
    The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'my.domain.com'
  

</code>

===== Failed authorization procedure.... =====
Error:
//Failed authorization procedure. www.example.com (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from...// 

There might redirect rules in effect. Try putting this in your .htaccess or vhost file:

  RewriteCond %{REQUEST_URI} !^\.well-known/(.*)$

===== SEC_ERROR_UNKNOWN_ISSUER with certbot in Firefox =====
If you get this weird error only on Firefox (89.0.2) and other browsers are ok, delete the existing certificate

  certbot delete

and run again
  certbot

This should resolve the issue.

====== Tested on ======
  * Debian 10.8
  * certbot 0.31.0

====== See also ======
  * [[wiki:install_certbot|Install certbot]]
  * [[wiki:certbot_installation|Install certbot via manual method]]
  * [[wiki:certbot_download_certificates_only|Certbot download certificates only]]
====== References ======
  * https://github.com/ansible/ansible/issues/67949