It seems to be something to do with running under VMware.
I've tried Windows 7 32-bit, Windows 7 64-bit and Windows Server 2008 32-bit, running on VMware Player and VMware ESXi, and in all cases I cannot get Kiwi to open up port 162 to receive SNMP traps.
Installations on physical hardware running Windows 7 and Windows Server 2008 work.
Exactly what the difference is I don't know, but it seems that Kiwi will not listen for SNMP traps when running under VMware.