I have configured an external NMS system to send traps to NetXMS. The traps are being received: they appear in the SNMP Trap Log and the SNMP Trap Monitor.

I've followed the instructions at another post - https://www.netxms.org/forum/configuration/snmp-trap-configuration/msg13657/#msg13657 - but haven't had any luck with it. I have created five Event Configuration items:

TRAP_RAW
TRAP_INFO
TRAP_EMERGENCY
TRAP_CRITICAL
TRAP_CLOSE

The trap OID is .1.3.6.1.4.1.27207.2.2.1.0.1. I've configured the SNMP Trap Configuration to use event "TRAP_RAW" upon receiving an trap with this OID.

I have an Event Processing Policy which calls this script when a TRAP_RAW trap is received:

if ($event->parameters[3] == alert)
{
    switch($event->parameters[2])
    {
        case 1:
            evt = "TRAP_CRITICAL";
            break;
        case 2:
            evt = "TRAP_EMERGENCY";
            break;
        case 3:
            evt = "TRAP_EMERGENCY";
            break;
        case 4:
            evt = "TRAP_EMERGENCY";
            break;
        case 5:
            evt = "TRAP_EMERGENCY";
            break;
        case 6:
            evt = "TRAP_INFO";
            break;
        case 7:
            evt = "TRAP_INFO";
            break;
        case 8:
            evt = "TRAP_INFO";
            break;
    }

    PostEvent($node,evt,null,$event->parameters[7]);
}
else
{
    PostEvent($node, "TRAP_CLOSE");
}

I also have two additional Event Processing Policies for creating the alarm and clearing it. However, no alarms are ever created in the Alarm Browser.

In summary:

I see the traps coming in via tcpdump.
The traps appear in the SNMP Trap Log
The traps appear in the SNMP Trap Monitor
Nothing appears in the Event Monitor
Nothing appears in the Event Log
Alarms are not generated

I'm at a loss as to how to troubleshoot at this point. Would anyone be able to lend a hand?

Just to cover as many bases as I can think of, here is a copy of the incoming trap from tcpdump

09:44:53.154160 IP itbox.49128 > event.snmp-trap:  C= V2Trap(1134)  system.sysUpTime.0=3322126 S:1.1.4.1.0=E:27207.2.2.1.0.1 E:27207.2.1.1.1.1.2=0 E:27207.2.1.1.1.1.3="alert" E:27207.2.1.1.1.1.4=0 E:27207.2.1.1.1.1.5=1400852702 E:27207.2.1.1.1.1.6="" E:27207.2.1.1.1.1.7="Threshold triggered -- switch0.fl2-closet0.wilm's Gi2/0/1's Availability: 0.00 Percent < 100 Percent averaged over 10.00 minutes" E:27207.2.1.1.1.1.8="ITBOX" E:27207.2.1.1.1.1.9=1 E:27207.2.1.1.1.1.10=192.168.10.40 E:27207.2.1.1.1.1.11="switch0.fl2-closet0.wilm" E:27207.2.1.1.1.1.12=1453 E:27207.2.1.1.1.1.13=192.168.10.18 E:27207.2.1.1.2.1.1="Critical Uplinks Availability - switch0.fl2-closet0.wilm - Gi2/0/1" E:27207.2.1.1.2.1.2="" E:27207.2.1.1.2.1.3=0 E:27207.2.1.1.2.1.4="" E:27207.2.1.1.2.1.5=23 E:27207.2.1.1.2.1.6="Uplink ports" E:27207.2.1.1.2.1.7="" E:27207.2.1.1.1.1.14="SNMP" E:27207.2.1.1.1.1.15=1 E:27207.2.1.1.1.1.16="SNMP Poller" E:27207.2.1.1.1.1.17="Gi2/0/1" E:27207.2.1.1.1.1.18=17716 E:27207.2.1.1.1.1.19="core0.wilm gi6/1" E:27207.2.1.1.1.1.20="s1_interfaceavailability" E:27207.2.1.1.1.1.21=120537 E:27207.2.1.1.1.1.22="Availability" E:27207.2.1.1.2.1.8=213743 E:27207.2.1.1.2.1.9=0 E:27207.2.1.1.2.1.10="0.00" E:27207.2.1.1.2.1.11="100" E:27207.2.1.1.2.1.12="Percent" E:27207.2.1.1.2.1.13=2 E:27207.2.1.1.2.1.14="10.00"