I have a domain top-level domain like example.com and a Second-Level Domains like ex.example.com, I set ssl certificate for Second-Level Domain,but is error,How should I set up？
You can get a certificate that includes both of them in the same certificate. Can you tell us more about your hosting setup and how you obtained your original certificate?
I get certificate for sslforfree and import it to iis is success. But set up website then call it, it’s error, it’s use the top-level domain certificate.
If you click on “Advanced” on sslforfree, it explains:
Multiple domains or subdomains are allowed and should be separated by spaces (e.g. “subdomain.domain.com domain.com otherdomain.org”). If the multiple domains or subdomains pertain to multiple directories then you must use manual verification and upload verification files to the correct directories.
So, you can get a certificate again but include all of the names, separated by spaces (like
ex.example.com example.com). The new certificate should then be valid for all of the names, so visitors to your site should no longer receive an error for example.com.
The certificate needs to include every name that users will use to visit the site.
I have primary domain name for certificate issued by the other institutions, so after I get the new certificate from sslforfree, so I can use the two certificates are still can only use one ？
Oh, that depends on your web server software. Most web servers can be configured to choose the appropriate certificate for the site that the client is trying to access, assuming that it is a modern client that indicates the desired host name via SNI.
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