Error occur when run hadoop dfs -put urls urls

[Boon Siong <bo...@asiaep.com>]

Dear all expert,

I receive a error when try to run this command, 
bin/hadoop dfs -put urls urls
or
bin/hadoop dfs -ls

hadoop-nutch-jobtracker-devcluster01.log

2006-06-26 23:21:59,541 WARN  fs.DFSClient - Problem renewing lease for DFSClient_-1571148747: java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:507)
        at java.net.Socket.connect(Socket.java:457)
        at java.net.Socket.<init>(Socket.java:365)
        at java.net.Socket.<init>(Socket.java:207)
        at org.apache.hadoop.ipc.Client$Connection.<init>(Client.java:112)
        at org.apache.hadoop.ipc.Client.getConnection(Client.java:351)
        at org.apache.hadoop.ipc.Client.call(Client.java:289)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:150)
        at org.apache.hadoop.dfs.$Proxy0.renewLease(Unknown Source)
        at org.apache.hadoop.dfs.DFSClient$LeaseChecker.run(DFSClient.java:405)
        at java.lang.Thread.run(Thread.java:595)

my nutch is runnig on centos 4.2 with java jdk1.5.0_06

Thank You.

Lee