Maybe the node is currently not available (shutdown or crashed), or the network connection to this node is not available.

Try to ping this node. If ok, try to startup ParaStation MPI. From an other node, "add" this node:

  psiadmin> add nodeid

Or logged on to this node, run psiadmin which also starts up the ParaStation MPI daemon psid. See the section called “ Problem: psiadmin returns error ” for more details.

Check the logfile /var/log/messages on this node for error messages. Verify that all nodes have an identical configuration (/etc/parastation.conf).