When you look up server4.empresascertificadasmx.com, the name suggests something to do with certified companies in Mexico. But what you actually get is an empty IIS server page with no encryption. That's a big disconnect. A legitimate certification service would have a proper website with contact details, an about page, and privacy policies. This site has none of that — not even a favicon.
Given the complete lack of transparency, asking “is server4.empresascertificadasmx.com a scam?” is reasonable, but the evidence is too thin to call it a scam outright. What we can say is it's not a functioning business site. There are no server4.empresascertificadasmx.com reviews online, and the Wayback Machine has no record of it ever being active. The safest bet is to treat it as unreliable until proven otherwise.