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

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Jon Friesen
DigitalOcean Employee
DigitalOcean Employee badge
October 6, 2020
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. :(

Is anyone able to find a solution to this error? Facing this problem with Vercel.