kernel_info reply timeout

[ksuderman]

When the Groovy kernel is launched Jupyter complains that there is a timeout waiting for kernel_info reply.

[defel]

Same problem with junyper labs:

[I 20:06:01.974 LabApp] Kernel restarted: 81f10a33-7ca2-49d4-b2ff-10cd2e0d67cc
2017-07-21 20:06:02,483 INFO  GroovyKernel [GroovyKernel.run:265] Groovy Jupyter kernel starting.
2017-07-21 20:06:02,684 INFO  HmacSigner [HmacSigner.<init>:47] Using signing hmac: e0cbd604-34e3cfd9e48bd6304e0c0934
2017-07-21 20:06:02,759 INFO  HeartbeatThread [AbstractThread.start:42] Thread starting.
2017-07-21 20:06:02,759 INFO  ControlThread [AbstractThread.start:42] Thread starting.
2017-07-21 20:06:02,760 INFO  HeartbeatThread [HeartbeatThread.run:35] Heartbeat thread starting.
2017-07-21 20:06:02,760 INFO  ShellThread [AbstractThread.start:42] Thread starting.
2017-07-21 20:06:02,760 INFO  ControlThread [ControlThread.run:40] ControlThread starting.
2017-07-21 20:06:02,763 INFO  ShellThread [ShellThread.run:36] ShellThread starting.
2017-07-21 20:06:03,931 INFO  KernelInfoHandler [KernelInfoHandler.handle:43] Processing kernel info request
[W 20:06:31.975 LabApp] Timeout waiting for kernel_info_reply: 81f10a33-7ca2-49d4-b2ff-10cd2e0d67cc