My data nodes in my new cloudera live cluster seem unable to reach the master node. I've tried restarting HDFS several times from Cloudera Manager and I get the following error message:   "Command aborted because of exception: Command timed-out after 150 seconds"   I can login to each machine using root and the passwords provided on the gogrid page. Should ssh be set up between these machines to not require entering a password? I'm not sure if I missed a step in the configuration or if it should be done automatically when the cluster is first deployed; of course it could be some other connectivity problem.   I think the following is a symptom of the same connectivity problem. If I ssh to one of the data nodes (I anonymized part of the hostname) and try to run this command, I get this error:   [root@XXXXX-cldraagent-01 ~]# hadoop fs -ls /user/hue ls: No Route to Host from XXXXX-cldraagent-01/10.NNN.NNN.3 to XXXXX-cldramaster-01:8020 failed on socket timeout exception: java.net.NoRouteToHostException: No route to host; For more details see: http://wiki.apache.org/hadoop/NoRouteToHost   I can ping the master from the agent (again anonymizing): ping XXXXX-cldramaster-01 PING XXXXX-cldramaster-01 (10.NNN.NNN.2) 56(84) bytes of data. 64 bytes from XXXXX-cldramaster-01 (10.NNN.NNN.2): icmp_seq=1 ttl=64 time=0.276 ms 64 bytes from XXXXX-cldramaster-01 (10.NNN.NNN.2): icmp_seq=2 ttl=64 time=0.358 ms   Appreciate any pointers, and apologies if this is a stupid question     ... View more