Using Chrome:ERR_SSL

Using Chrome:ERR_SSL_VERSION_OR_CIPHER_MISMATCH

Subdomains are second-level domains

The other subdomain sites are fine, only this one subdomain’s ssl protocol is not supported. But when I temporarily disable the traffic proxy for the A record of this subdomain, the ssl using the source server is just fine.

I followed some tutorials, removed generic SSL, enabled it again and it still doesn’t work, all other subdomain sites under the domain are fine

To add
When I visit the other subdomain: b.example.com after opening
(other subdomains are normal)
I was able to access a.example.com after re-accessing the previously unsupported protocol

Could you share the subdomain having the issue?

I used CNAME and the problem was solved.