host not shown in monitor overview

[fabionico]

Hi,
I've installed Zabbix 1.8.2 on Debian squeeze, all is gone well, nothing error.
I create a host and select icmpping as item (preconfigured, as host group and template), it is shown in monitor-overview, in attemp to receive data, but after few seconds it disappear!
Any suggestion? what can I do?

[Inc0]

Check the log file and see if there are any errors

[fabionico]

Check the log file and see if there are any errors

I've checked these log

/var/log/zabbix-server/zabbix_server.log
/var/log/apache2/error.log
/var/log/postgresql/postgresql-8.4-main.log

... and not found any error