Rac GRID instal hangs at oracle.cluster.deployment.ractrans.ClientHandlerSupervisor.threadCleanup

Rac grid installation hangs as below
 
Error:
======
Node-2 hangs as below
 
Exception in thread "Install API Thread" java.lang.NullPointerException
        at oracle.cluster.deployment.ractrans.ClientHandlerSupervisor.threadCleanup(ClientHandlerSupervisor.java:981)
        at oracle.cluster.deployment.ractrans.RACTransfer.cleanup(RACTransfer.java:1757)
        at oracle.cluster.deployment.ractrans.RACTransfer.transferDirStructureToNodes(RACTransfer.java:747)
        at oracle.cluster.deployment.ractrans.RACTransfer.transferDirToNodes(RACTransfer.java:253)
        at oracle.ops.mgmt.cluster.ClusterCmd.transferDirToNodes(ClusterCmd.java:3119)
        at oracle.ops.mgmt.cluster.ClusterCmd.transferDirToNodes(ClusterCmd.java:3038)
        at oracle.sysman.oii.oiip.oiipg.OiipgClusterOps.transferDirToNodes(OiipgClusterOps.java:947)
        at oracle.sysman.oii.oiif.oiifw.OiifwClusterCopyWCCE.doOperation(OiifwClusterCopyWCCE.java:544)
        at oracle.sysman.oii.oiif.oiifb.OiifbCondIterator.iterate(OiifbCondIterator.java:171)
        at oracle.sysman.oii.oiif.oiifw.OiifwActionsPhaseWCDE.doOperation(OiifwActionsPhaseWCDE.java:633)
        at oracle.sysman.oii.oiif.oiifb.OiifbLinearIterator.iterate(OiifbLinearIterator.java:147)
        at oracle.sysman.oii.oiic.OiicInstallAPISession$OiicAPISelCompsInstall.doOperation(OiicInstallAPISession.java:1072)
        at oracle.sysman.oii.oiif.oiifb.OiifbCondIterator.iterate(OiifbCondIterator.java:171)
        at oracle.sysman.oii.oiic.OiicInstallAPISession.doInstallAction(OiicInstallAPISession.java:656)
        at oracle.sysman.oii.oiic.OiicInstallAPISession.access$000(OiicInstallAPISession.java:91)
        at oracle.sysman.oii.oiic.OiicInstallAPISession$OiicActionsThread.run(OiicInstallAPISession.java:948)

Solution:
=========
Confirm that you have disabled the "iptables"

Check if firewall is running
# service iptables status
If it is running, stop it and retry instalation.
# service iptables stop