We are using an application running on a local server, which is linked to a domain-name via a DMZ in a router. Of course, the link between the ISP IP address and the domain name is established as well.
Since yesterday (Monday) morning, we came to realize that the Web application was not available for the different agencies. We thought something went wrong with the router, but swapping the latter didn't solve the problem.
Actually, we didn't really understand why pinging on the domain-name wouldn't yield any response. When using a command-line prompt, my computer (and other computers) don't receive any response.
Using tools online to obtain the IP address from the domain name returns correct results. Are those results real time ? or could they be cached on a regular basis?
Based on the afore-mentioned, what do you think the problem could be?