Nagios service checks stopped

Nagios Nagios Configuration support
1

Hi,

we set up our own little nagios installation to check some servers on the HWR-Berlin. A sample Host definition is postet below. The problem is now, that the service checking did stop after the first succesfull check. Did I get something wrong in the definition part? The checked service is simple html or ping. I am also not able to reschedule a check via the webmasc, after 5 minutes of waiting the website goes white and brings a gateway error:
Gateway Time-out

The gateway did not receive a timely response from the upstream server or application.
Apache/2.2.13 (Linux/SUSE) Server at 194.94.22.60 Port 80

Could this be due to firewall issues?

define host{

        host_name                       192.168.10.158

        alias                           alias

        address                         192.168.10.158

        #parents

        check_command                   check-host-alive

        check_interval                  5

        retry_interval                  1

        max_check_attempts              5

        check_period                    24x7

        process_perf_data               0

        retain_nonstatus_information    0

        contact_groups                  admins

        notification_interval           30

        notification_period             24x7

        notification_options            d,u,r

        }

Thanks for any help in advance!

2

Is nagios still running when it stops cehcking?

the host definition looks good… is the check rescehduled? (cick on the service check in the web interface to see when the check is rescheduled…

3

Well the service shows this:
Next Scheduled Check: 12-14-2009 15:34:28

Which kinda buffles me, since nagios sais its running, and properly restarts from the console if i want it to. But since i am not able to force checks through the web interface either, i have the feeling that something with the apache rights is not right.

4

is the date setup correctly?