when go to let's encrypt in virtual server
select : Domain names listed here, and input domainname.com only,
start the request cert.
Validating configuration for [domainname.com] .. .. no problems found Requesting a certificate for [domainname.com], *.[domainname.com] from Let's Encrypt .. .. request failed : Web-based validation failed : Wildcard hostname *.[domainname.com] can only be validated in DNS mode, DNS-based validation failed
so I want to know how to get the wild card cert. anything wrong ?