If zabbix cant open connection to server i get this situation:
zabbix zabbix_agentd_noc 22920 6* internet6 stream tcp d4e51540
zabbix zabbix_agentd_noc 22920 7* internet6 stream tcp d6b49d20
zabbix zabbix_agentd_noc 22920 8* internet6 stream tcp d6b89d20
zabbix zabbix_agentd_noc 22920 9* internet6 stream tcp d6d67d20
zabbix zabbix_agentd_noc 22920 10* internet6 stream tcp d6cb0000
zabbix zabbix_agentd_noc 22920 11* internet6 stream tcp d6cb2540
zabbix zabbix_agentd_noc 22920 12* internet6 stream tcp d6cd4d20
zabbix zabbix_agentd_noc 22920 13* internet6 stream tcp d6d577e0
zabbix zabbix_agentd_noc 22920 14* internet6 stream tcp d6cb8540
zabbix zabbix_agentd_noc 22920 15* internet6 stream tcp d6c72d20
zabbix zabbix_agentd_noc 22920 16* internet6 stream tcp d6baf2a0
zabbix zabbix_agentd_noc 22920 17* internet6 stream tcp d6d65540
zabbix zabbix_agentd_noc 22920 18* internet6 stream tcp d6b8e7e0
zabbix zabbix_agentd_noc 22920 19* internet6 stream tcp d6d52d20
zabbix zabbix_agentd_noc 22920 20* internet6 stream tcp d6cb77e0
zabbix zabbix_agentd_noc 22920 21* internet6 stream tcp d6c77a80
zabbix zabbix_agentd_noc 22920 22* internet6 stream tcp d6cbcd20
zabbix zabbix_agentd_noc 22920 23* internet6 stream tcp d6c7a7e0
zabbix zabbix_agentd_noc 22920 24* internet6 stream tcp d6d60d20
zabbix zabbix_agentd_noc 22920 25* internet6 stream tcp d6cb97e0
zabbix zabbix_agentd_noc 22920 26* internet6 stream tcp d6bf4000
zabbix zabbix_agentd_noc 22920 27* internet6 stream tcp d6afc2a0
zabbix zabbix_agentd_noc 22920 28* internet6 stream tcp d6cc0a80
zabbix zabbix_agentd_noc 22920 29* internet6 stream tcp d6cbca80
zabbix zabbix_agentd_noc 22920 30* internet6 stream tcp d6d6e000
zabbix zabbix_agentd_noc 22920 31* internet6 stream tcp d6d6b2a0
zabbix zabbix_agentd_noc 22920 32* internet6 stream tcp d6d1e2a0
zabbix zabbix_agentd_noc 22920 33* internet6 stream tcp d6cbba80
zabbix zabbix_agentd_noc 22920 34* internet6 stream tcp d6cbfa80
zabbix zabbix_agentd_noc 22920 35* internet6 stream tcp d6a2a540
zabbix zabbix_agentd_noc 22920 36* internet6 stream tcp d6cba000
zabbix zabbix_agentd_noc 22920 37* internet6 stream tcp d6c787e0
zabbix zabbix_agentd_noc 22920 38* internet6 stream tcp d6c7a540
zabbix zabbix_agentd_noc 22920 39* internet6 stream tcp d6c81a80
zabbix zabbix_agentd_noc 22920 40* internet6 stream tcp d6c71000