OS X: Nothing received from server on UDP port 60003

Reproduction

1. Ran mosh-server and got the following output

> mosh-server

MOSH CONNECT 60003 SaHaHCFHl3b93sZkEsZDZA

mosh-server (mosh 1.4.0) [build mosh-1.3.2.95rc1-13-gc516fb4-dirty]
Copyright 2012 Keith Winstein <[email protected]>
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

[mosh-server detached, pid = 83878]

1. Copied the key
2. Ran env MOSH_KEY="SaHaHCFHl3b93sZkEsZDZA" mosh-client 192.168.0.200 60003

Expected

The client should connect to the mosh-server and display my login shell

Actual

Instead it seems to make initial ssh connection, but the mosh connection hangs:

mosh: Nothing received from server on UDP port 60003

Environment

What I've tried

• Followed the debug guide on the wiki and used the netcat command to listen on UDP port 60003, then used netcat in another terminal pane to send a message. It worked as expected.
• It does work on localhost env MOSH_KEY="<key>" mosh-client 127.0.0.1 60003 but not my local network IP like the example above
• Disabled the firewall on OS X and my router, setup port forwarding as well

Any help would be appreciated!