You’ve connected an external domain name (Gandi, Infomaniak, OVH, LWS, Cloudflare…) to your Copilhost account, but something isn’t working? Here are the 4 errors we see most often. Take 5 minutes to check what might be blocking your domain!
Missing trailing dot on a CNAME entry
Some CNAME entries provided by Copilhost end with a dot. For example: mysite.com.e970b53c7524cf92.dcv.cloudflare.com. This dot is an integral part of the value. Without it, DNS resolution won’t work.
✅ Make sure you’ve copied and pasted it in full at your registrar.
Duplicate domain name in the source
Some registrars (like Gandi) automatically append your domain name to the source field. If you enter _acme-challenge.mysite.com, the final DNS zone becomes _acme-challenge.mysite.com.mysite.com and the entry won’t work.
✅ Check the preview of your DNS zone to make sure no domain name appears twice. If it does, remove it from the source field you’re entering.
Missing underscore (_) at the beginning of the source
Copilhost-specific entries often start with an underscore: _acme-challenge, _cf-custom-hostname. Without this underscore, the connection will fail.
✅ Make sure you’ve copied _acme and not acme (or _cf and not cf).
Forgotten “www” subdomain
If your site is unreachable at www.mysite.com (404 or broken redirect), the www subdomain connection hasn’t been set up — it’s not automatic for external domains.
✅ Full procedure in our dedicated article: Configure your site on the www subdomain.
Tip: check your DNS zone in real time. You can verify what the rest of the internet sees using DNSChecker.org. If an entry you’ve added doesn’t appear there, it wasn’t saved correctly at your registrar (or propagation is still in progress).
TTL tip. Temporarily lower the TTL to 5 minutes so your changes take effect quickly. You can set it back to 1 hour once the connection is confirmed.
If your connection is still showing an error after these checks, contact us via the chat in your Copilhost account, 7 days a week from 8am to 8pm. We’ll review your DNS zone together.