I’ve been trying to set up my custom domain cosmictrex.xyz for several hours and SSL won’t work despite showing “Valid Configuration” in the dashboard.
Setup:
Domain registered with Squarespace
Nameservers pointing to Vercel (ns1.vercel-dns.com, ns2.vercel-dns.com)
Project deploys fine at mental-models-observatory.vercel.app
DNS Records in Vercel:
A record: @ → 216.198.79.1
CNAME: www → 1846d44f34375e7c.vercel-dns-017.com
ALIAS: * → cname.vercel-dns-017.com
The problem:
When I visit https://cosmictrex.xyz, I get “This site can’t provide a secure connection” (ERR_SSL_PROTOCOL_ERROR). The Vercel dashboard shows green checkmarks and “Valid Configuration” for both root and www domains.
What I’ve tried:
Removed and re-added the domain
Switched nameservers between Squarespace and Vercel multiple times
Updated A record to new IP (216.198.79.1)
Waited for propagation (several hours)
Clicked Refresh repeatedly
It seems like Vercel is not provisioning the SSL certificate. Any help appreciated.d the problem!
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 @jacksonshapiro11-126, thank you for waiting. The domain cosmictrex.xyz, at this time, is accessible and not showing any errors i.e. it has a valid SSL certificate. You’ll also note that if visit Project Settings > Domains via the Vercel dashboard, your domain will be appearing marked “verified configuration”. Let us know should you still have follow-up Qs or any concerns, we’re here to help ya out! 
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