Original agent: many connecions are established by OS, but not accepted by agent. aws-proxy01-za ~ # ss -np | grep 10.1.6.3:10050 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:39841 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:37857 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:52991 tcp ESTAB 0 79 10.1.6.3:10050 10.229.3.10:33561 users:(("zabbix_agent2",pid=397553,fd=10)) tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:49949 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:40205 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:43135 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:55415 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:40899 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:47769 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:53165 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:38799 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:51539 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:55591 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:46825 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:51101 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:60611 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:51977 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:34149 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:43249 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:45373 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:46073 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:45403 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:56477 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:35607 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:46419 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:40363 tcp SYN-RECV 0 0 10.1.6.3:10050 10.229.3.10:38047 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:53897 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:60137 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:53055 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:37971 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:57857 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:51307 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:36405 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:32975 tcp ESTAB 327 0 10.1.6.3:10050 10.229.3.10:35695 Sample output with modified agent: several connections are accepted by agent and being processed aws-proxy01-za ~ # ss -np | grep 10.1.6.3:10050 tcp ESTAB 0 79 10.1.6.3:10050 10.1.8.16:46669 users:(("zabbix_agent2",pid=398042,fd=13)) tcp ESTAB 0 258 10.1.6.3:10050 10.1.8.16:34471 users:(("zabbix_agent2",pid=398042,fd=15)) tcp ESTAB 0 0 10.1.6.3:10050 10.229.3.10:39177 users:(("zabbix_agent2",pid=398042,fd=10)) tcp ESTAB 0 79 10.1.6.3:10050 10.229.3.10:36199 users:(("zabbix_agent2",pid=398042,fd=11)) tcp ESTAB 0 258 10.1.6.3:10050 10.229.3.10:56925 users:(("zabbix_agent2",pid=398042,fd=14)) tcp ESTAB 0 258 10.1.6.3:10050 10.1.8.16:56211 users:(("zabbix_agent2",pid=398042,fd=16)) tcp ESTAB 0 79 10.1.6.3:10050 10.1.8.16:52425 users:(("zabbix_agent2",pid=398042,fd=12))