Broker keeps loosing connection to downstream broker

[ghost]

I have a C-broker running and see that the broker is losing its connection to his downstream broker from a DGLux instance. Initially I suspected this to be an issue with DGLux but I have a second broker running with the dart implementation and there are no connection issues whatsoever over a period of 24h. Note that all brokers are running on the same machine.

Excerpt from the log (note there are dozens of reconnects over a period of ~24h):

...
2016-09-08 11:52:38 INFO [handshake] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has connected
2016-09-08 11:55:34 INFO [broker] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has disconnected
2016-09-08 11:55:38 INFO [broker] - DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I connecting
2016-09-08 11:55:38 INFO [handshake] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has connected
2016-09-08 11:58:35 INFO [broker] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has disconnected
2016-09-08 11:58:38 INFO [broker] - DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I connecting
2016-09-08 11:58:38 INFO [handshake] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has connected
2016-09-08 12:01:35 INFO [broker] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has disconnected
2016-09-08 12:01:38 INFO [broker] - DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I connecting
2016-09-08 12:01:38 INFO [handshake] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has connected
2016-09-08 12:04:35 INFO [broker] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has disconnected
2016-09-08 12:04:38 INFO [broker] - DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I connecting
2016-09-08 12:04:38 INFO [handshake] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has connected
2016-09-08 12:07:35 INFO [broker] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has disconnected
2016-09-08 12:07:38 INFO [broker] - DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I connecting
2016-09-08 12:07:38 INFO [handshake] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has connected
2016-09-08 12:10:35 INFO [broker] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has disconnected
2016-09-08 12:10:38 INFO [broker] - DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I connecting
2016-09-08 12:10:38 INFO [handshake] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has connected
2016-09-08 12:13:35 INFO [broker] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has disconnected
2016-09-08 12:13:38 INFO [broker] - DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I connecting
2016-09-08 12:13:38 INFO [handshake] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has connected
2016-09-08 12:16:35 INFO [broker] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has disconnected
2016-09-08 12:16:38 INFO [broker] - DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I connecting
2016-09-08 12:16:38 INFO [handshake] - DSLink `DGLuxInternalBroker-Pr8QZnE8tm7VBC8Y8h0x_1NYKF3mE4NZAZP2-4QvP2I` has connected
...

Setup:

---------------  ------------
| Dart-Broker |  | C-Broker |
---------------  ------------
    |      \      /       |
    |       \    /        |
---------  ---------  ------------------
| dsash |  | DGLux |  | dslink-weather |
---------  ---------  ------------------