HP Systems Insight Manager - Manual (Page 199)

If you have created subscriptions on a Windows managed system and then elect to change the
WMI Mapper proxy or install a WMI Mapper on the managed system, you must first unsubscribe
for WBEM events, change the proxy, re-identify the systems, and then resubscribe for WBEM
events. If you do not unsubscribe for the WBEM events, HP SIM will no longer receive indications
from the managed system.
WMI Mapper 199