This means that the nodemgr_listener process died.
Possible reasons are: (check the nodemgr_listener logfile in /home/iray/cm)
1. “temporary name resolution failure” (there is still a bug that it looks up the wrong interface)
Solution: Workaround: add the IP address that could not be resolved to /etc/hosts
2. “cannot receive own multi-cast traffic” or “Got a synchronizer announce from higher priority
synchronizer. Leaving the group”
Usually both error messages indicate multi-cast problems
Solution: Check for multicast issues (see article 3584 here: http://nvidia.custhelp.com/app/answers/detail/a_id/3584/kw/udp/session/L3RpbWUvMTQxMjAxNTY5NS9zaWQvMkdSa0REM20%3D )