Why Does a Domain Work With www but Not Without It?

The www hostname and the apex domain are separate DNS names and may point to different services. A redirect configured for one host does not prove that the other resolves or has a matching virtual host and certificate.

What to check

Compare apex and www A, AAAA, and CNAME answers at authoritative nameservers. Check DNS provider support for apex records, web server host configuration, redirect rules, and certificate coverage for both names.

Recommended next step

Configure both hostnames intentionally and choose a canonical destination. Test DNS resolution and HTTPS for each name from more than one network before changing existing redirect behavior.

How Informatix Systems can help

Informatix Systems provides domain, DNS, and website hosting services. We can assess the affected setup, trace the likely cause, and help plan an implementation path. Contact us with the system involved, when the issue began, and non-sensitive error details.