Hello community. I am sure this has been asked a million times, and I am unsure of exactly what information is needed here so I will do my best to keep it short and simple and answer any questions as they are asked.
This issue started about 3 months ago, when a competitor to my site decided to mass report me as “fraud and phishing” to every blacklist known to man kind. Some reports stuck, others did not, but it was enough. I have spent 2.5 months fixing this after finding out, and this is the last issue I can’t seem to figure out.
Random users will state that they get the dreaded error:
"This site can’t provide a secure connection, Sammichscripts.com uses an unsupported protocol.
Few things to know:
- Website is using Lets Encrypt certificate, with Full - Strict on CF side. The universal CF cert has also been verified, marked as active, and registers properly.
- The site has as far as I can tell everything properly setup for SSL from… Certs, to preloading, to HSTS, to automatic rewrites for HTTPS, you name it.
- SSLShopper has the full SSL chain proper, SSLLabs rates everything A+, Cloudflare Diagnostics only states DS record is missing, and we don’t use DNSSEC so I am not sure that matters.
- I have tried everything I can find to resolve this, including completely removing all certs from CF, Lets encrypt, and all SSL rules from my site… Re-issuing everything, waiting 7 days, full propagation completes and still no luck.
I am a bit at a loss… The only thing that seems to fix it for the clients having issues… is to change their DNS to public ones like googles 188.8.131.52 or CF 184.108.40.206. Then magically the Mismatch just… goes away.
What can I provide, and do to help troubleshoot this?
Thanks to everyone who takes the time to respond. It is greatly appreciated.