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The following error occurs on an attempt to secure domain/subdomain/alias with Let's Encrypt via Domains > example.com > Let's Encrypt:
PLESK_ERROR: Detail: DNS problem: NXDOMAIN looking up A for alias.example.com
The following may be seen on the notification taskbar:
PLESK_WARN: An issue ocurred 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.
Domain from the error,
alias.example.comin this example, cannot be resolved globally.
Note: The error may also occur for the
webmail.example.comand for the domain with
- The domain/subdomain/alias does not resolve globally:
# dig @184.108.40.206 +short subdomain.example.com
# dig @220.127.116.11 +short alias.example.com
# dig @18.104.22.168 +short www.example.com
The following can be found in
CONFIG_TEXT: ERR [extension/letsencrypt] Domain validation failed for webmail.example.com: Invalid response from https://acme-v01.api.letsencrypt.org/acme/authz/aIPfYgujjNY_d7gGU4g5iAfJ2HfieC5aAL1bwgSRJi8. Details: Type: urn:acme:error:connection Status: 400 Detail: dns :: DNS problem: NXDOMAIN looking up A for webmail.example.com
ERR [extension/letsencrypt] Domain validation failed: Missed domain names failed to pass validation: webmail.example.com
A DNS record does not exist for:
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:
Open Domains > example.com > Let's Encrypt leave all checkbox empty and issue the certificate:
The following article describes how to troubleshoot issues with Let's Encrypt certificate installation Let's Encrypt installation fails: Challenge marked as invalid.