How can I make nrepl-ritz-jack-in work remotely over TRAMP / Emacs
Solution 1:
If the repl is still running from the previous cider-jack-in, you should either use the cidercommand to connect to the running instance, or stop the previous before starting a new one
From Here `Clojure - connection issue re-running cider-jack-in
Also see this https://devcenter.heroku.com/articles/debugging-clojure