From the article:

> Around this time, you realize that the web interface for this thing has some stuff that phones home, and part of what it does is to send stack traces back to sentry.io. Yep, your browser is calling back to them, and it's telling them the hostname you use for your internal storage box. Then for some reason, they're making a TLS connection back to it, but they don't ever request anything. Curious, right?

Unless you actively block all potential trackers (good luck with that one lol), you're not going to prevent leaks if the web UI contains code that actively submits details like hostnames over an encrypted channel.

I suppose it's a good thing you only wasted 30 seconds on this.