Question

My custom domain is showing SSL Mismatch error

After I added a custom domain to my app, when I visit that domain it shows me a SSL version or cipher mismatch error.

This site can’t provide a secure my-website.com uses an unsupported protocol.
ERR_SSL_VERSION_OR_CIPHER_MISMATCH
Subscribe
Share

Submit an answer
You can type!ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Accepted Answer

This can happen when the CNAME isn’t yet configured before adding it to app. Our TLS certificate issuer caches the NXDOMAIN (not found) DNS record, and the TLS certificate issuing is delayed. Normally it resolves automatically once the NXDOMAIN cache expires in about 30 minutes.

I have the same problem, Many hours, and the problem persist. :(

I seem to have the same issue. What I want to do is point a subdomain to my DO app.

Added a new app (the feature is great btw!), deployed it, and then added a new CNAME entry to my DO networking (DNS is managed by DO). Then getting “ERR_SSL_VERSION_OR_CIPHER_MISMATCH”.

What did I do wrong here?

I made the error of adding the custom domain before the DNS entry was refreshed (due to TTL time). I’ve destroyed custom domain and added it again and now it works.