Domain Stuck on Invalid SSL/Cipher

I am having an issue where my custom subdomain is showing a severe SSL error, even though the configuration is marked as valid in the dashboard and the CNAME record has fully propagated.

Domain: italy7percent.caesartheday.com
Target CNAME: 943a5e82c88b3b18.vercel-dns-017.com

Problem Details:

The Vercel dashboard shows the domain configuration is Valid (or is stuck on Generating SSL Certificate).
In the browser, the site fails to load with the error: ERR_SSL_VERSION_OR_CIPHER_MISMATCH. This suggests the Vercel edge is serving an incorrect or expired certificate (likely a fallback).
I have confirmed via external DNS checkers that the correct CNAME record is propagating globally.
I have removed and re-added the domain in my project settings multiple times to re-trigger the SSL issuance.
There are no CAA records on the root domain that would block Let's Encrypt.

The domain troubleshooting guide can help with most custom domain configuration issues. You might be able to use that guide to solve it before a human is available to help you. Then you can come back here and share the answer for bonus points.

https://vercel.com/docs/projects/domains/troubleshooting

You can also use v0 to narrow down the possibilities.

Hey, Caesar! Welcome 👋

Gave you had a look at this thread? May be helpful! https://community.vercel.com/t/err-ssl-version-or-cipher-mismatch-on-custom-domain/22205/5?u=pawlean

I also recommend going through these docs: https://vercel.com/docs/domains/troubleshooting#common-ssl-certificate-issues

Hey ! 👋

Just wanted to follow up here. If you've found a solution or still need help, let us know! We're happy to continue assisting.