Hi Darren,   I'm facing the same problem. Eventhough datanode port points to 1004. other than port anything has to changed? i'm using cdh5.5.2.    Error,   Exception in secureMain java.io.IOException: Failed on local exception: java.net.SocketException: Permission denied; Host Details : local host is: "hadoop03.rlpl.com"; destination host is: (unknown):0; at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:772) at org.apache.hadoop.ipc.Server.bind(Server.java:424) at org.apache.hadoop.ipc.Server.bind(Server.java:396) at org.apache.hadoop.hdfs.net.TcpPeerServer.<init>(TcpPeerServer.java:111) at org.apache.hadoop.hdfs.server.datanode.DataNode.initDataXceiver(DataNode.java:921) at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:1144) at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:453) at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:2402) at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:2289) at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:2336) at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:2513) at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:2537) Caused by: java.net.SocketException: Permission denied at sun.nio.ch.Net.bind0(Native Method) at sun.nio.ch.Net.bind(Net.java:463) at sun.nio.ch.Net.bind(Net.java:455) at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) at org.apache.hadoop.ipc.Server.bind(Server.java:407)   Thanks,    Venkat ... View more