Не удалось выполнить вызов для домена с использованием Certbox

#ssl-certificate #vps

Вопрос:

Следуя этому руководству, создайте SSL — сертификат для моего сайта. Использует Express.js приложение. Появляется ошибка, показанная ниже.

 
Which names would you like to activate HTTPS for?
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1: regaladin.com
2: www.regaladin.com
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Select the appropriate numbers separated by commas and/or spaces, or leave input
blank to select all options shown (Enter 'c' to cancel):
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for www.regaladin.com
Waiting for verification...
Challenge failed for domain www.regaladin.com
http-01 challenge for www.regaladin.com
Cleaning up challenges
Some challenges have failed.

IMPORTANT NOTES:
 - The following errors were reported by the server:

   Domain: www.regaladin.com
   Type:   dns
   Detail: DNS problem: NXDOMAIN looking up A for www.regaladin.com -
   check that a DNS record exists for this domain