Help: ICP Gateway returns Error 400 Unknown Domain

Developers
24

I’m experiencing the same issue with my apex domain mimento.ai.

  • The domain was working fine before — then suddenly stopped issuing a valid certificate.

  • www.mimento.ai continues to work without any problems.

  • For the apex domain, the status now loops between PendingAcmeApproval and Failed: order is unable to reach 'Ready' status.

  • All CAA, TXT, and _acme-challenge CNAME records are correct and DNS resolves properly.

  • I also deleted the previous registration request and created a new one, but the problem persists.

As a temporary workaround, I enabled Cloudflare proxy for the apex CNAME record and set up a redirect from mimento.ai → www.mimento.ai.

This avoids the certificate error, but it’s not a real fix.
Is there a known issue on the DFINITY side regarding ACME for apex domains, or any way to manually reset the challenge?

2 Likes
SSL Certificate Error on icptokens.net