Unable to install the Let’s Encrypt certificate on a subdomain of an alias in Plesk

Symptoms

• Unable to create the certificate for the subdomain alias as the alias is not present on the list of objects to renew the certificate for dev.alias.com at Domains > dev.example.com > Let’s Encrypt. .

• The domain alias.com is an alias for example.com

• Accessing to dev.alias.com returns invalid Common name.

  NET::ERR_CERT_COMMON_NAME_INVALID

Cause

It is caused by a bug in the product with the ID #EXTLETSENC-696 which will be fixed in future Plesk updates.

Resolution

As a workaround, it’s possible to create the subdomain dev.example.com as an independent domain and then create the alias dev.alias.com.