check_smtp - Invalid SMTP response received from host

[Dennis Hünseler]

Hi Nick,

are you able to connect to machine xx.xx.xx.xx on port 25 by telnet 
during the error occurs?
Or maybe the smtp service gives a temporary failure for external 
connections because of high load for example. Took a look in the 
mail.log what is written down there ?

Kind regards, Dennis
>
>     Hi All
>
>     For a few hours a day off and on, I get the following warning from "check_smtp -H xx.xx.xx.xx" 
>     command running on the main Nagios host:
>
>     "Invalid SMTP response received from host"
>     "SMTP WARNING - 0.005 sec. response time|time=0.004907s;;;0.000000"
>
>     During this problem, if I run the same command on machine xx.xx.xx.xx, it returns:
>
>
>
>
>
>     SMTP OK - 0.005 sec. response time|time=0.005030s;;;0.000000
>
>     This affects only one machine out of many.
>
>     Any ideas appreciated.
>
>     TIA, Nick
>
>      
>
>
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