Hi,
I want to monitor one port of my remote box, so I crate a item zabbix using a net.tcp.port[192.168.101.1,443] then I create a trigger expression:

=0.
In the last step I create a action, then I change port from 443 to 444 but I still get result "1" not "0".
In zabbix agent log I have error:

666:20150415:084619.367 active checks #1 [idle 1 sec]
661:20150415:084619.367 collector [processing data]
661:20150415:084619.367 In update_cpustats()
661:20150415:084619.367 End of update_cpustats()
661:20150415:084619.367 collector [idle 1 sec]
663:20150415:084620.326 TCP expect network error: cannot connect to [[192.168.101.1]:443]: [4] Interrupted system call

zabbix-agent cannot connect to port 443, but result all the thime is "1".