[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live) [Help](/c/help/9) # Domain Stuck on Invalid SSL/Cipher 70 views · 0 likes · 4 posts CaesarTheDay (@caesartheday) · 2025-10-26 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:** 1. The Vercel dashboard shows the domain configuration is **Valid** (or is stuck on **Generating SSL Certificate**). 2. 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). 3. I have confirmed via external DNS checkers that the correct CNAME record is propagating globally. 4. I have **removed and re-added** the domain in my project settings multiple times to re-trigger the SSL issuance. 5. There are **no CAA records** on the root domain that would block Let's Encrypt. system (@system) · 2025-10-26 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://community.vercel.com/t/introducing-the-vercel-leaderboard/1358). https://vercel.com/docs/projects/domains/troubleshooting You can also use [v0](https://v0.dev/) to narrow down the possibilities. Pauline P. Narvas (@pawlean) · 2025-10-28 Hey, Caesar! Welcome :waving_hand: 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 system (@system) · 2026-01-20 Hey @caesartheday! 👋 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.