Port 137 is used by NETBIOS Name Service. It isn't something LANDesk would be doing. Either this server is trying to talk to a machine and using this as a way to resolve the machine name (not sure what might be causing this to be continuous) or you may have an infection as searching on the web I find a few references to this port being used in security attacks.
General NetBIOS info here : http://en.wikipedia.org/wiki/NetBIOS
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