Cheking non-open ports... Is it possible ????

[le jert]

Hi !

In order to check firewall security, I would like to know how I can
check if certain ports are closed (and not open, as usually). I mean
writing 'ok' for the service if ports 80,23,... are closed.
This would also be usefull for checking ftp or whatever else are
installed on non-authaurised machines.

Thanks

Note : I'm running nagios-1.0 with pluggin 1.3.0 beta2 on a redhat 7.3


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