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Be sure that, if you have firewalls running on the server or node machines, you allow connections on the appropriate ports for each machine. Torque pbs_mom daemons use UDP ports 1023 and below if privileged ports are configured (privileged ports is the default). The pbs_server and pbs_mom daemons use TCP and UDP ports 15001-15004 by default.
Firewall based issues are often associated with server to MOM communication failures and messages such as 'premature end of message' in the log files.
Also, the tcpdump program can be used to verify the correct network packets are being sent.
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