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Knowledge Base

 Let’s Encrypt installation error on Plesk server: DNS problem: NXDOMAIN looking up A

 
applications extensionsdnsdomain namedomain namesdomains

Symptoms

  • The following error occurs on an attempt to secure domain/subdomain/alias with Let's Encrypt via Domains > example.com > SSL/TLS Certificates:

    Detail: DNS problem: NXDOMAIN looking up A for alias.example.com

    Detail: DNS problem: query timed out looking up A for alias.example.com

  • The following may be seen on the notification taskbar:

    An issue occurred while securing the domain example.com:
    The certificate has been issued. Some alternative domain names were excluded.
    Domains that have not been secured are listed below. Please secure them manually.
    · www.example.com
    · webmail.example.com
    · alias.example.com 

  • The domain from the error, alias.example.com in this example, cannot be resolved globally.

    Note: The error may also occur for the webmail.example.com and for the domain with www prefix, e.g. www.example.com.

Cause

Missing DNS record

Resolution

Use one of the following solutions:

  • Correct DNS settings:

    • If Plesk is used as DNS server, add the required records as described in the following article How to add a DNS record for a domain in Plesk

    • In case if DNS are hosted outside of Plesk, create the records on the DNS registrars side.

      Note: after correcting DNS settings, it is required to wait until a DNS zone is propagated through the Internet. It may take up to 48 hours.

  • Secure only main domain, e.g example.com:

    1. Log into Plesk.

    2. Open Domains > example.com > SSL/TLS Certificates > Install(at the bottom) and leave only Secure the domain name checkbox toggled and issue the certificate:

      mceclip0.png

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