Can anyone provide any hints as to why this might be happening; 

I have hadoop running all process' on one machine (for trouble-shooting)
and when I go to submit a job from another machine I get the following
exception;

INFO   | jvm 2    | 2008/07/30 06:05:05 | 2008-07-30 06:05:05,117 ERROR
[HadoopJobTool] java.io.IOException: Unknown protocol to name node:
org.apache.hadoop.mapred.JobSubmissionProtocol
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.dfs.NameNode.getProtocolVersion(NameNode.java:84)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
java.lang.reflect.Method.invoke(Method.java:597)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.ipc.RPC$Server.call(RPC.java:446)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)
INFO   | jvm 2    | 2008/07/30 06:05:05 |
INFO   | jvm 2    | 2008/07/30 06:05:05 |
org.apache.hadoop.ipc.RemoteException: java.io.IOException: Unknown
protocol to name node: org.apache.hadoop.mapred.JobSubmissionProtocol
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.dfs.NameNode.getProtocolVersion(NameNode.java:84)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
java.lang.reflect.Method.invoke(Method.java:597)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.ipc.RPC$Server.call(RPC.java:446)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)
INFO   | jvm 2    | 2008/07/30 06:05:05 |
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.ipc.Client.call(Client.java:557)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:212)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
$Proxy4.getProtocolVersion(Unknown Source)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.ipc.RPC.getProxy(RPC.java:313)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.ipc.RPC.getProxy(RPC.java:300)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.mapred.JobClient.createRPCProxy(JobClient.java:383)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.mapred.JobClient.init(JobClient.java:376)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.mapred.JobClient.<init>(JobClient.java:346)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:958)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
com.rialto.profiler.profiler.clickstream.hadoop.HadoopJobTool.run(Hadoop
JobTool.java:129)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
com.rialto.profiler.profiler.clickstream.hadoop.HadoopJobTool.launchJob(
HadoopJobTool.java:142)
INFO   | jvm 2    | 2008/07/30 06:05:05 |       at
com.rialto.profiler.profiler.clickstream.RawStreamGenerator.run(RawStrea
mGenerator.java:138)

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