When I was playing with my Emacs configs today, a tramp related message suddenly appeared in minibuffer: 1 Tramp: Opening connection nil for dev using ssh... My Emacs also hang at the same moment since the dev host is out of reach. I haven’t used tramp for sometime, so when I first saw this message, I was curious about which function trigger tramp. I have some experience in troubleshooting tramp hang issue before, and I know that some seemingly unrelated functions will access the opened tra...