А на недосервере стоит NetXMS агент? Если да (или можно поставить), то агент может работать как прокси (и для других агентов, и для SNMP).
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You have to wait for 2.0.3 release or build agent from git repository.
MasterServers = 127.0.0.1, ::1, 10.5.0.0/24
LogFile = /opt/netxms/log/nxagentd.log
SubAgent = portcheck.nsm
[PORTCHECK]
NegativeResponseTimeOnError = true