Data collection is systematically stopped with active check agents after a network problem or server reboot.

Fo example, I had to reboot my zabbix server (1.4.2) and since that, all client data collection is stopped (configured in check active). As a consequence, monitoring is not working anymore for many days.

If I restart manually zabbix agent on a node it works again, but it is unthinkable to restart all my zabbix agent (about 150 and more to come as the target is 500 nodes)....

Thank you for your support.