I have a cluster with 1 namenode and 6 datanodes. After decommissioning 3 of the datanodes. Our YARN service is always bad health. And seems like the nodemanager on one of the datanodes never gets started successfully. Then I tried to restart the nodemanager on that box. And here are the logs. 

```
2014-08-01 11:19:08,217 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NodeManager metrics system shutdown complete.
2014-08-01 11:19:08,217 FATAL org.apache.hadoop.yarn.server.nodemanager.NodeManager: Error starting NodeManager
org.apache.hadoop.yarn.exceptions.YarnRuntimeException: org.apache.hadoop.yarn.exceptions.YarnRuntimeException: Recieved SHUTDOWN signal from Resourcemanager ,Registration of NodeManager failed, Message from ResourceManager: Disallowed NodeManager from  box708.datafireball.com, Sending SHUTDOWN signal to the NodeManager.
    at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.serviceStart(NodeStatusUpdaterImpl.java:185)
    at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
    at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:121)
    at org.apache.hadoop.yarn.server.nodemanager.NodeManager.serviceStart(NodeManager.java:197)
    at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
    at org.apache.hadoop.yarn.server.nodemanager.NodeManager.initAndStartNodeManager(NodeManager.java:352)
    at org.apache.hadoop.yarn.server.nodemanager.NodeManager.main(NodeManager.java:398)
Caused by: org.apache.hadoop.yarn.exceptions.YarnRuntimeException: Recieved SHUTDOWN signal from Resourcemanager ,Registration of NodeManager failed, Message from ResourceManager: Disallowed NodeManager from  box708.datafireball.com, Sending SHUTDOWN signal to the NodeManager.
    at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.registerWithRM(NodeStatusUpdaterImpl.java:255)
    at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.serviceStart(NodeStatusUpdaterImpl.java:179)
    ... 6 more

```

I googled around this error but cannot find the solution, any guidance from anyone?