PBS Error & Solution node down: communication closed

1)node down: communication closed #pbsnodes -a node1 Mom = node1.hcl.com Port = 15002 pbs_version = PBSPro_12.0.1.130184 ntype = PBS state = state-unknown,down pcpus = 2 resources_available.host = node1 resources_available.ncpus = 2 resources_available.vnode = node1 resources_assigned.accelerator_memory = 0kb resources_assigned.mem = 0kb resources_assigned.naccelerators = 0 resources_assigned.ncpus = 0 resources_assigned.netwins = 0 resources_assigned.vmem = 0kb comment = node down: communication closed resv_enable = True sharing = default_shared license = l master Mom = master.hcl.com Port = 15002 pbs_version = PBSPro_12.0.1.130184 ntype = PBS state = job-busy pcpus = 1 jobs = 49.master/0 resources_available.arch = linux resources_available.host = master resources_available.mem = 502348kb resources_available.ncpus = 1 resources_available.vnode = master resources_assigned.accelerator_memory = 0kb resources_assigned.mem = 0kb resources_assigned.naccelerators = 0 resources_assigned.ncpus = 1 resources_assigned.netwins = 0 resources_assigned.vmem = 0kb resv_enable = True sharing = default_shared license = l

Solution:

1)we have to check whether PBS is running or not

2)Network connectivity.

3)should add in the /etc/pbs.conf file.

PBS_SCP=/usr/bin/scp