I'm using Ubuntu 15.04, this gist (https://gist.github.com/yantonov/10083524) to install the haskell platform dependencies, and then I do a git pull to my repo and build my binary.

Everything compiles, but when I do ./cabal-sandbox/bin/app or 

./dist/build/app/app, nothing happens. No error messages or anything - the terminal just goes to the next line and hangs (on my Mac development machine the server starts up fine and prints a startup message).

Any ideas or experience with deploying Scotty / Haskell apps would be really appreciated, thanks!