Zabbix appliance is built on SuSE 12.2 which by default runs SuSEfirewall2. Problems with allowing UDP SNMP return traffic.
New to SuSE so an introduction to YAST and creating a custom firewall rule resulted in this change in /etc/sysconfig/SuSEfirewall2 :
FW_SERVICES_ACCEPT_EXT="10.2.0.0/8,udp,,161"
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