When you visit authentication.proshipping.net expecting a shipping authentication service, you're met with a 404 error page. That alone should stop you in your tracks. A legitimate business doesn't leave its front door broken.
Even if the site were operational, the red flags pile up. There's no WHOIS record — the owner is completely anonymous. For any service that handles logins or personal data, that's a non-starter. There's no contact information, no about page, no privacy policy, and no terms of service. The site has zero web history: no Wayback Machine snapshots, no reviews, no social media presence.
While the technical security setup looks solid (encryption, security headers, Cloudflare), it doesn't matter if the site isn't serving any content. This domain is essentially a dead address with a hidden owner. Our advice: don't enter any personal information here, and don't proceed further until the site proves it's legitimate — which it currently shows no signs of doing.