check don t work

[Basile Mathieu]

nagios 1.3.1
plugins 1.3.1
OS      linux redhat 7.2

the probleme i have is that nagios don t perform any checks
i verify it with ethereal
i have the same problem at home , nagios don t ping a host although
i can ping it
if someone have an idea
thanks
ps
there is another problem
when i stop nagios , to restart i have to delete before the 
var/rw/nagios.cmd file
and when i want to perform check i have to change the mode of this file ( 
and after
there is no check that is perform )



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