When generating a CSR for a wildcard TLS/SSL certificate you have to ensure the domain is in the correct format.
A wildcard certificate secures unlimited sub-domains. You must generate the CSR specifying where the wildcard sub-domain using a *.
For example to generate a CSR to secure all sub-domains of servertastic.com you would enter the domain as follows
This would also secure servertastic.com as the base domain.
If you needed a deeper wildcard you could generate the CSR as follows
This would secure unlimited sub-domains above sub.servertastic.com. However it would not secure sub.servertastic.com.
It is not possible to secure multiple sub-domain levels using a wildcard. The following examples are not permitted in wildcard certificates.
*.*.servertastic.com sub.*.servertastic.com *.com
Servertastic can supply Wildcard TLS/SSL certificates at discounted pricing.
Updated over 2 years ago