Task Tracker not starting

[siva kumar]

Hi,
        Im trying to build a Fresh hadoop cluster. Im using cloudera
manager 5.5.1 and CDH 5.5.2. Hdfs is up and running. When i start Map
Reduce (MR1) job tracker is up but all task trackers are not starting.
error:

Command aborted because of exception: Command timed-out after 150 seconds


Any help?

regards,

siva