Err_ssl_protocol_error

Help
1

hey guys I recently purchased a domain via Vercel and configured a CNAME record for auth.*****.dev, pointing it to us.kinde.com. The DNS record has propagated correctly and is verified on Kinde’s end.

However, when attempting to visit auth.*****.dev, I receive the following error:

This site can’t provide a secure connection  
auth.*****.dev sent an invalid response.  

ERR_SSL_PROTOCOL_ERROR

Troubleshooting Performed:

  • Confirmed CNAME record:
auth.*****.dev. 60 IN CNAME us.kinde.com.
  • Checked CAA records → None directly set on my domain; inherits from kinde.com.
  • Verified _acme-challenge TXT records are being managed by Kinde.
  • Waited for propagation (issue persists).
2

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.

5

i already checked this but still nothing found usefull