Issue with subdomain certificate in a specific scenario

Security
#1

Hi.

I have 2 sites, setup completely the same way, but 1 is bugging in only a specific scenari. I have setup certbot certificates, the SSL/TLS certificates is in Full mode, and the www. version of the sites are setup as CNAMEs to their non-www versions.

One of the sites is subdomain of the other.

The first site, let’s say it is site.geo.tld, works fine when I visit it like:
site.geo.tld
www.site.geo.tld
https://site.geo.tld
https://www.site.geo.tld

For the second site there is issue in only one scenario. All of the following work fine:
blog.site.geo.tld
www.blog.site.geo.tld
https://blog.site.geo.tld

But, but, when i visit:
https://www.blog.site.geo.tld I am presented with the following error:

Firefox: Error code: SSL_ERROR_NO_CYPHER_OVERLAP
Chrome: ERR_SSL_VERSION_OR_CIPHER_MISMATCH (uses an unsupported protocol)

I have no idea why this might me happening, since the 2 sites are setup identically. Would someone happen to have even a slight idea, what may be causing this behavior?

Thanks.

#2

The should be Full (Strict) since you’re using Certbot.

I’m surprised this works, but the underlying issue you’re facing is most likely due to this:

#3

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