CertificateNonvalidError: Unable to verify challenge


I just added a new domain to my Netlify site, and switched the primary domain to the new domain added. I’m trying to get the certificate working, but it looks like it’s failing.
Can someone help me figure out what’s not working?

The netlify website is landracebakery.netlify.app
(Changed domain from landracebakery dot com to landrace dot co dot uk).

This is the error i get:

### SSL/TLS certificate
SniCertificate::CertificateNonvalidError: Unable to verify challenge for landrace.co.uk: 2a05:d014:9da:8c10:624d:5ea1:12e9:798b: Invalid response from http://landrace.co.uk/.well-known/acme-challenge/pCYFRo5CqVCBmYNThK_-w9ZYOi0O0AKZhUTc9T5QIUo: 404

We can’t renew your Let’s Encrypt certificate automatically until the issue is resolved. Check our troubleshooting guide for more information on how to fix the problem, and then renew the certificate.

Let’s Encrypt
*.landracebakery.com, landracebakery.com

Mar 18, 2020 at 4:44 AM

Nov 23, 2022 at 9:20 AM

Feb 21 (in a month)

Thanks in advance!

Hi @binghongcha and welcome to our Support Forums!

Before the SSL Certificate can be provisioned, you’ll need to set your nameservers for landrace dot co dot uk at your registrar/DNS provider. You can find those name servers here: Netlify App

Let us know how that goes!

1 Like

Thank you for the reply @laura!

I think I had made a mess with the domains, as the certificate was still providing for the previous domain and not the new one :sweat_smile:

I think now the nameservers should be sorted, and it looks like the certificate is not failing anymore, just a matter of waiting for DNS propagation.

Hopefully that will be sorted soon!
Thanks again - will get in touch again if it still not working :slight_smile:

Hi @binghongcha :wave:t6:,

Thanks for letting us know!