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If parts of your letsencrypt renewals succeed and others give you “urn:acme:error:connection” then just retry

Posted by jpluimers on 2018/12/10

On the same server, part of my letsencrypt renewals worked fine, while others had an error like this:

-------------------------------------------------------------------------------
Processing /etc/letsencrypt/renewal/spring4d.4delphi.com.conf
-------------------------------------------------------------------------------
Cert is due for renewal, auto-renewing...
Renewing an existing certificate
Performing the following challenges:
tls-sni-01 challenge for spring4d.4delphi.com
Waiting for verification...
Cleaning up challenges
Attempting to renew cert from /etc/letsencrypt/renewal/spring4d.4delphi.com.conf produced an unexpected error: Failed authorization procedure. spring4d.4delphi.com (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Error getting validation data. Skipping.
...
 - The following errors were reported by the server:

   Domain: spring4d.4delphi.com
   Type:   connection
   Detail: Error getting validation data

   To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A 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.

A retry worked fine:

-------------------------------------------------------------------------------
Processing /etc/letsencrypt/renewal/spring4d.4delphi.com.conf
-------------------------------------------------------------------------------
Cert is due for renewal, auto-renewing...
Renewing an existing certificate
Performing the following challenges:
tls-sni-01 challenge for spring4d.4delphi.com
Waiting for verification...
Cleaning up challenges
...
The following certs were successfully renewed:
  /etc/letsencrypt/live/spring4d.4delphi.com/fullchain.pem (success)

–jeroen

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