Inverting the nagios output

[Tom DE BLENDE (DHL BE)]

Use check_tcp together with negate.

pawel.siwek at sgcib.com wrote:

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>   A little question.. Nagios is designed as I discovered to monitor        
>   whether the services are down.. Me I want to see whether the services    
>   are up. I want to see if one port is open in all machines and if it's    
>   up make nagios send me notifications.                                    
>   So for me the down status is ok, but nagios when it see that the answer  
>   is "Connection refused by host" it generates automatically critical      
>   error.                                                                   
>   I tried to add ./check_tcp -H xxx -p aaa -e Connection refused by host,  
>   but it didn't run.... Any ideas?                                         
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