Simple check in 1.8

[rubendob]

Hello

I've read some threads about but actually still no idea of how to do it. I create a n item of some template like

net.tcp.service(tcp,,3389) -> RDS of windows for example

I link template to a host

Then item returs is not supported by Zabbix Agent. I really don't know what I must do. Some people says one thing, some people another :-S

Any have some idea?

Thanks guys