Simple Check using telnet always returns false (0)

[brdr]

Hi,

I'm using a simple check -> net.tcp.service[telnet,,16905]
When I telnet a server from the Zabbix server it succeeds using above port.

from command line:
$ time telnet server1 16905
Trying 192.17.xxx.xxx...
Connected to server1.
Escape character is '^]'.
Connection closed by foreign host.

real 0m0.039s
user 0m0.000s
sys 0m0.001s

This indicates the port is open. However, Zabbix reports as being down via the front-end as trigger gets fired. It looks like any valid port check is failing.

The trigger expressioin is:
{Temp App Eagle App Process Check:net.tcp.service[telnet,,16905].max(#3)}=0

--From the Zabbix server log I see entries when it goes to evaluate MAX
--function. The last 2 lines indicates Zabbix indicates failure on my trigger
--13653.

810:20140512:120433.243 In evaluate_MAX()
810:20140512:120433.243 In __get_function_parameter_uint31() parameters:'#3' Nparam:1
810:20140512:120433.243 In substitute_simple_macros() data:'#3'
810:20140512:120433.243 __get_function_parameter_uint31() flag:1 value:3
810:20140512:120433.243 End of __get_function_parameter_uint31():SUCCEED
810:20140512:120433.243 In zbx_vc_get_value_range() itemid:23982 value_type:3 seconds:0 count:3 timestamp:1399910672
810:20140512:120433.243 End of zbx_vc_get_value_range():SUCCEED count:3 cached:1
810:20140512:120433.243 End of evaluate_MAX():SUCCEED
810:20140512:120433.243 End of evaluate_function():SUCCEED value:'0'
810:20140512:120433.243 End of zbx_evaluate_item_functions()
810:20140512:120433.243 In zbx_substitute_functions_results() ifuncs_num:2 tr_num:3
810:20140512:120433.243 zbx_substitute_functions_results() expression[0]:'(0=0&{13100}>75)|(0=1&{13100}>65)' => '(0=0&0.001695>75)|(0=1&0.001695>65)'
810:20140512:120433.243 zbx_substitute_functions_results() expression[1]:'{13324}=0' => '0=0'
810:20140512:120433.243 zbx_substitute_functions_results() expression[2]:'{13326}=0' => '0=0'
810:20140512:120433.243 End of zbx_substitute_functions_results()
810:20140512:120433.243 End of substitute_functions()
810:20140512:120433.243 In evaluate() expression:'(0=0&0.001695>75)|(0=1&0.001695>65)'
810:20140512:120433.243 End of evaluate() value:0.000000
810:20140512:120433.243 In evaluate() expression:'0=0'
810:20140512:120433.243 End of evaluate() value:1.000000
810:20140512:120433.243 In evaluate() expression:'0=0'
810:20140512:120433.243 End of evaluate() value:1.000000
810:20140512:120433.243 End of evaluate_expressions()
810:20140512:120433.243 In process_triggers() values_num:3
810:20140512:120433.243 In process_trigger() triggerid:13467 value:0(0) new_value:0
810:20140512:120433.243 End of process_trigger():FAIL
810:20140512:120433.243 In process_trigger() triggerid:13653 value:1(0) new_value:1810:20140512:120433.243 End of process_trigger():FAIL

[brdr]

Fixed it

In my first attempt(s) I used this item key:

net.tcp.service[telnet,,16905]

To fix, I used this item key:
net.tcp.service[tcp,,16905]

Cheers,
Don