AS400 ping

I have the following definition in the hosts.cfg to ping an AS400 server:

define host {
host_name as400
use generic-host
alias AS400
address 192.168.2.203
}

define service {
use generic-service
host_name as400
service_description PING
contact_groups admins
check_command check_ping!100.0,20%!500.0,60%
}

In nagios, I see the host but the status is pending :This host has not yet been checked, so status information is not available.

why??

any ideas??

Thanks

Strange , the status for the host is PENDING and the service PING for the same host is Ok.

Why??

Thanks