Why Does a Business Website Work Internally but Not From the Internet?

Internal access may use private DNS, a VPN, or a local network route that bypasses public DNS and firewall rules. External visitors can fail even while employees see a working site.

What to check

Compare internal and public DNS answers, public IP and NAT, firewall rules, load balancer health, TLS certificate, and server logs. Confirm the public route reaches the intended host and virtual site.

Recommended next step

Correct the external DNS or network path while preserving internal access controls. Validate from an independent network and review exposure before opening additional services.

How Informatix Systems can help

Informatix Systems provides DNS, hosting, and network services. We can assess the affected environment, narrow down the failure, and help plan a practical correction. Contact us with the system involved, when the issue began, and non-sensitive error details.