UIM snmptd probe not receiving traps in trap monitor

Document ID : KB000122401
Last Modified Date : 05/12/2018
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Issue:
Forwarding traps from juniper firewall , however the snmptd probe is not collecting the trap from it. 
Traps are getting received in Wireshark on the same server where the snmptd probe is installed.
Environment:
UIM 8.51
snmptd 3.30
Cause:
Can see rejected message for the traps from concerned device in snmptd probe logs
========= 
Nov 20 10:41:25:640 [13620] snmptd: (DecodeV2Trap) - Matched second varbind to .1.3.6.1.6.3.1.1.4.1.0 (Good V2 trap). 
Nov 20 10:41:25:640 [13620] snmptd: (DecodeV2Trap) - Get trapId from snprint_value - .1.3.6.1.2.1.15.7.2 
Nov 20 10:41:25:644 [13620] snmptd: (DecodeV2Trap) - trapDescr - SNMP v2 TRAP 
Nov 20 10:41:25:644 [13620] snmptd: Rejected! Community not in list 
Nov 20 10:41:25:646 [13620] snmptd: Rejected! Community not in list 
Nov 20 10:41:25:646 [13620] snmptd: (DecodeV2Trap) - Matched second varbind to .1.3.6.1.6.3.1.1.4.1.0 (Good V2 trap). 
Nov 20 10:41:25:646 [13620] snmptd: (DecodeV2Trap) - Get trapId from snprint_value - .1.3.6.1.2.1.15.7.2 
Nov 20 10:41:25:650 [13620] snmptd: (DecodeV2Trap) - trapDescr - SNMP v2 TRAP 
Nov 20 10:41:25:650 [13620] snmptd: Rejected! Community 
==========
Resolution:

The symptom is related to incorrect / missing community string

In snmptd probe gui config under Security Properties

1. Confirm if the community string related to this device is present or not .
     If present double-check the correct community string spelling. This is in the probe settings under security manager > Community tab. Please note that this is case sensitive as well. 

2. Add a "*" in the community string for testing 

https://docops.ca.com/ca-unified-infrastructure-management-probes/ga/en/alphabetical-probe-articles/snmptd-simple-network-management-protocol-trap-daemon-monitoring/snmptd-im-configuration#snmptdIMConfiguration-ManageUserandSecurity

Can specify the following security aspects: 

Community: The SNMP-TRAP v1 contains community strings. Here you can specify the incoming traps that the snmptd probe accepts. 
Normally, the community string Public is used. A * (or no community string at all) means that all incoming traps are accepted.