If you've come across vm3-proxy-pta-wus-sjc01p-3.connector.his.msappproxy.net, you might be wondering if it's something to worry about. The short answer is no — this is not a typical website. It's a Microsoft Azure Application Proxy connector endpoint, used behind the scenes to let employees access company applications securely. That's why you can't reach it in a browser: it's designed to talk only to other Microsoft services, not to the public internet.
All the signals confirm that. The SSL certificate is issued by Microsoft, the hosting network is Microsoft's own, and there are no blacklist or malware flags. The lack of a favicon, a sitemap, or a Trustpilot profile makes perfect sense for what this is. So if you're wondering 'is vm3-proxy-pta-wus-sjc01p-3.connector.his.msappproxy.net a scam?' — it's not. It's legitimate infrastructure with a clear owner. There's nothing here to buy, sign up for, or trust beyond the fact that it's part of the Microsoft ecosystem. If you see this hostname in network logs at work, it's just your company's proxy at play.