I’m having a ERR_SSL_VERSION_OR_CIPHER_MISMATCH on my partner’s work laptop on the domain anka-aktas.com which is hosted with Vercel. The project’s default domain foto-anka.vercel.app does work. I have another domain on vercel which also works https://www.sjaakluthart.nl. Both projects have similar valid configurations on the vercel dashboard. What could be the issue here?
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.
You can also use v0 to narrow down the possibilities.
Hey! Welcome 
It looks like the SSL error on your custom domain, while the Vercel default domain works fine, points to something going on with either SSL certificate provisioning or your DNS configuration for anka-aktas.com.
First, double-check your DNS setup to make sure the records are pointing to Vercel’s servers correctly, whether you’re using A, AAAA, or a CNAME record. Then, head over to your project’s Domains section in the Vercel Dashboard and take a look at the SSL certificate status. If it’s stuck on “Pending” or showing as “Failed,” try removing and re-adding the domain to refresh the certificate.
It’s also worth making sure your domain itself is fully configured in the project settings. Sometimes removing it and adding it again can trigger a fresh SSL certificate and resolve the issue.
Since this is happening specifically on your partner’s work laptop, another thing to keep in mind is their corporate network. Some networks enforce strict SSL/TLS policies or block certain cipher suites, which can cause this kind of error. If that’s the case, try loading the site explicitly with https:// and see if that helps.
For more details, you can check out the Custom Domains documentation or the SSL troubleshooting guide.
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