Adding custom domain to app failing?


So I had a site working fine in netlify for a while, it seemed to stop working, the site cannot be found, so I removed it and added it again. Still no joy on the site custom domain loading.

I used and I’m getting the following error.

Hostname/IP does not match certificate's altnames: Host: is not in the cert's altnames: DNS:*,

Any help would be great, I feel like something might need tweaking either on my account directly or in netlify DNS.


which custom domain is this regarding?

Hey Perry

It was in the error message. It’s


Yep, just a small tweak needed!

DNS for your www looks great:
$ host is an alias for

But your bare domain could use some love:
$ host has address has IPv6 address 2604:a880:2:d0::1354:7001

That A record IP address should be changed to And you’ll want to delete that IPv6 record.

Then click the Renew certificate button in our UI and you’ll have things working better in no time.