Zabbix server doesn't receive SNMP traps

[ProTON]

OK, so I have went through all the docs online, the wiki and googled a lot, however I'm still unable to get Zabbix server to accept SNMP traps.

I'm using Zabbix 2.0.5 and zabbix_trap_receiver.pl Perl script as trapper.

1) I have successfully configured snmptrapd with snmptrapd.conf:

authCommunity   log,execute,net public
perl do "/usr/share/doc/zabbix-server-2.0.5/zabbix_trap_receiver.pl";

The snmptrapd daemon is up and running. I have ensured that Perl file is loaded by running snmptrapd with -Debug options.

2) When SNMP trap is received I get the data written to /tmp/zabbix_traps.tmp file too.

11:41:42 2013/05/08 ZBXTRAP 127.0.0.1
PDU INFO:
  notificationtype               TRAP
  version                        1
  receivedfrom                   UDP: [127.0.0.1]:47382->[127.0.0.1]:162
  errorstatus                    0
  messageid                      0
  community                      public
  transactionid                  79
  errorindex                     0
  requestid                      215266672
VARBINDS:
  DISMAN-EVENT-MIB::sysUpTimeInstance type=67 value=Timeticks: (4029649) 11:11:36.49
  SNMPv2-MIB::snmpTrapOID.0      type=6  value=OID: SNMPv2-SMI::enterprises.3142.3.1.1.5.1
  SNMPv2-SMI::enterprises.3142.3.1.1.2.3 type=4  value=STRING: "just here"

3) Zabbix server is configured with SNMPTrapperFile=/tmp/zabbix_traps.tmp and StartSNMPTrapper=1
I can see trapper process starting when the server is started:

24752:20130508:130445.840 server #25 started [snmp trapper #1]

However no matter what I do the trap is never received by the zabbix server. I cannot even get it in the logs even though I have "Log unmatched SNMP traps" enabled in the server.

Any pointers?