# CertificateNonvalidError: Unable to verify challenge **URL:** \ **Category:** Support\ **Tags:** netlify-dns-https-ssl\ **Created:** [January 11, 2023, 5:50pm UTC](https://answers.netlify.com/t/certificatenonvaliderror-unable-to-verify-challenge/83040 "2023-01-11T17:50:37Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![binghongcha](https://sea1.discourse-cdn.com/netlify/user_avatar/answers.netlify.com/binghongcha/32/44599_2.png) [@binghongcha](https://answers.netlify.com/u/binghongcha)\ **Post date:** [January 11, 2023, 5:50pm UTC](https://answers.netlify.com/t/certificatenonvaliderror-unable-to-verify-challenge/83040/1 "2023-01-11T17:50:37Z")
Hi! 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](https://app.netlify.com/sites/landracebakery/settings/domain#ssl-tls-certificate)_ _**SniCertificate::CertificateNonvalidError: Unable to verify challenge for [landrace.co.uk](http://landrace.co.uk): 2a05:d014:9da:8c10:624d:5ea1:12e9:798b: Invalid response from [http://landrace.co.uk/.well-known/acme-challenge/pCYFRo5CqVCBmYNThK\_-w9ZYOi0O0AKZhUTc9T5QIUo:](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](https://docs.netlify.com/domains-https/troubleshooting-tips/#certificates-and-https) for more information on how to fix the problem, and then renew the certificate. Certificate Let’s Encrypt Domains \*.landracebakery.com, [landracebakery.com](http://landracebakery.com) Created Mar 18, 2020 at 4:44 AM Updated Nov 23, 2022 at 9:20 AM Expires Feb 21 (in a month) Thanks in advance! Giulio ---
**Author:** ![laura](https://sea1.discourse-cdn.com/netlify/user_avatar/answers.netlify.com/laura/32/6274_2.png) [@laura](https://answers.netlify.com/u/laura)\ **Post date:** [January 12, 2023, 8:52pm UTC](https://answers.netlify.com/t/certificatenonvaliderror-unable-to-verify-challenge/83040/2 "2023-01-12T20:52:58Z")
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](https://app.netlify.com/teams/binghongcha/dns/landrace.co.uk#name-servers) Let us know how that goes! ---
**Author:** ![binghongcha](https://sea1.discourse-cdn.com/netlify/user_avatar/answers.netlify.com/binghongcha/32/44599_2.png) [@binghongcha](https://answers.netlify.com/u/binghongcha)\ **Post date:** [January 13, 2023, 8:36am UTC](https://answers.netlify.com/t/certificatenonvaliderror-unable-to-verify-challenge/83040/3 "2023-01-13T08:36:40Z")
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 😅 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 🙂 ---
**Author:** ![SamO](https://sea1.discourse-cdn.com/netlify/user_avatar/answers.netlify.com/samo/32/41847_2.png) [@SamO](https://answers.netlify.com/u/SamO)\ **Post date:** [January 13, 2023, 2:56pm UTC](https://answers.netlify.com/t/certificatenonvaliderror-unable-to-verify-challenge/83040/4 "2023-01-13T14:56:02Z")
Hi @binghongcha 👋🏿, Thanks for letting us know!