Err ssl version or cipher mismatch

my subdomain keeps bringing this error.
ERR_SSL_VERSION_OR_CIPHER_MISMATCH yet the primary/main domain is working perfectly.”

what causes this and how can I fix it?

Thank you

Your post included an error message of ERR_SSL_VERSION_OR_CIPHER_MISMATCH so I clicked it, some suggestions here:

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It is not a browser problem because I have tried using other computers too. I think it has something to do with the DNS records. I am not sure though.

The issue is with 1 particular subdomain. The main domain and other subdomains work perfectly.

I need guidance.

In the article linked to twice in this thread there are several solutions. As you say it is a subdomain, it might be that you are using https://www.subdomain.example.com or similar. The default Cloudflare Universal certificates only;y cover one level of subdomain like https://subdomain.example.com. For greater levels of subdomain you would need to subscribe to Cloudflare Advanced Certificate Manager.

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