Certificate for subdomain


I have a domain that has a certificate let’s encrypt.
I made a redirection on my web host concerning my subdomain.

It points to: https://mydomain.com/mysecondesite/

So: web.mydomain.com points to the address above.
Normally, it should have the SSL certificate.

When I access web.mydomain.com, the certificate is not valid:

There are issues with the site’s certificate chain (net :: ERR_CERT_COMMON_NAME_INVALID).

How to make this subdomain use the primary domain certificate?

Thanks your in advance !

Hi @Mathie,

You can’t. They are considered completely separate entities by the browser and CA. You should get a new certificate covering the subdomain (or covering both names) using the same method that you used to get your original certificate.

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