SSL it! shows that a wildcard certificate is issued for a subdomain:
The wildcard certificate is actually issued for the main domain:
# true | openssl s_client -connect sub.example.com:443 -servername sub.example.com 2>/dev/null | openssl x509 -noout -text | grep DNS:
Note: Replace the 2 occurrences of
sub.example.comin the command by the proper subdomain name.
- #EXTSSLIT-595 "When a subdomain is secured with a wildcard SSL/TLS certificate, the extension now correctly shows if subdomain’s components (domain aliases, webmail, the www subdomain) are secured or not secured."
- SSL It! 1.1.2 16 October 2019
If update is not possible for some reason you may try the following
There is currently no available workaround, however, it is considered as a cosmetic bug and therefore, should have no real impact.
To issue a wildcard certificate for a subdomain:
Log into Plesk
Go to Domains > sub.example.com > SSL/TLS Certificate
Click on Reissue Certificate
Select Secure the wildcard domain (including www and webmail) and click on Get it free