How to restart Zabbix agent using a Remote Command

[Umair]

Hello, I have a Trigger and and Alarm set to activate when Zabbix agent on a host goes down.
Everything works fine.

The only problem which i cannot get through is, how to restart the Zabbix agent once it is down?

I tried using the remote Command:

{HOSTNAME}:/usr/local/bin/zabbix_agentd

(where the zabbix agent binaries are in: /usr/local/bin/zabbix_agentd)

but it does not work.
any suggestions would be appreciated.
Zabbix server 1.4.2 and Zabbix agent 1.4.1