How to Generate a CSR for a wildcard SSL/TLS certificate

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 you would enter the domain as follows


This would also secure as the base domain.

If you needed a deeper wildcard you could generate the CSR as follows


This would secure unlimited sub-domains above However it would not secure

It is not possible to secure multiple sub-domain levels using a wildcard. The following examples are not permitted in wildcard certificates.


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