Hello,
I’m seeing an issue where calls to xzy.m.pipedream.net are getting blocked by the “Cyber Security” component of some DSL modems (Century Link C4000XG for example). Very similar to this issue: Reddit - Dive into anything. As a somewhat fix in most cases, I’m able to turn off the Cyber Security feature on the modem (because it’s likely causing other issues), but in other cases we don’t manage the modem and cannot turn it off. I have no idea what it would take to get whitelisted on whatever list McAfee Cyber Security is using, but it’s probably worth looking into in the event this becomes a larger issue.