Pressing Enter kills the master server in my case with the very uninformative traceback:
Error: ENOTSOCK, Socket operation on non-socket
at Socket._readImpl (net.js:132:23)
at Socket._onReadable (net.js:627:22)
at IOWatcher.onReadable [as callback] (net.js:177:10)
this checkin causes cluster to break with kue and other strange bugs: https://github.com/LearnBoost/cluster/commit/9cb38c8b665d2be375f423d2f6653db4c152b40d
Pressing Enter kills the master server in my case with the very uninformative traceback:
Reverting the change fixes the problem.