the "Z" in availability colon

[Jaybee101]

Hi

I have successfully configured and start the zabbix agent on several workstations in my enviroment. my problem is , under configuration>host the status colon does indicate on each and every workstation that it is ENABLED but
the Availability colon has all icons (including the "Z") grey. They suppose to be green when active...right?

[Atsushi]

Whether the host is doing the monitoring using Zabbix agent?
Can you get items values for that host?

If you use active check only, It does not become green.