'Why is pry-remote just hanging?

I'm running a Rails 4 app with pry-remote, and calling binding.pry_remote. I can see stdout prints [pry-remote] Waiting for client on druby://127.0.0.1:9876, but when I run pry-remote at this point, the command just hangs.

Is there anything I can investigate to troubleshoot?

rubypry


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