It’s been driving me insane. I exclusively use Zerotier for ssh and it works fine for my assortment of other clients. It used to work from my iphone over Tmo’s LTE with an ssh client, but stopped some time ago (works over wifi just fine). I assumed I did something wrong but I haven’t been able to figure out what.
However for me it’s all ports including HTTP that are blocked when over cell phone connection. (just to be clear, I can reach other public hosts fine).
It might not be ZT at fault, but I hope someone else has insights.