I have a trusted cluster behind a locked-down router which works well via a proxy on the open Internet. However when I configure a port forwarding on this router to my bastion server (for an independent purpose) Teleport will not connect, I’m not sure why. What networking tools can I use to see what is failing? Or, put it another way, what is the requirement of the trusted cluster? Is it only outgoing port 3024 to the proxy?