Check_smtp

[Lydia Leung]

Thanks for the reply.

I do get the banner immediately using telnet. I did think it might be
the revise IP look up. But when I dig that IP from Nagios box, I did get
the right host name.

Is there any way to change the plug-in?

Cheers...

-----Original Message-----
From: nagios-users-admin at lists.sourceforge.net
[mailto:nagios-users-admin at lists.sourceforge.net] On Behalf Of
nagios at mm.quex.org
Sent: Thursday, 23 December 2004 4:26 PM
To: nagios-users at lists.sourceforge.net
Subject: Re: [Nagios-users] Check_smtp

On Thu, Dec 23, 2004 at 03:25:29PM +1100, Lydia Leung wrote:
>  
> I am using Check_smtp to check mail service.
>  
> Anyone knows how check_smtp works?
>  
> When I use the internal IP address, I get 0 sec response, which 
> returns a critical warning in the web.
> ./check_smtp -H 192.168.250.10 -t 4
> SMTP OK - 0 second response time
> Socket timeout after 4 seconds
>  
> If I use telnet 192.168.250.10 25, I can see the smtp service is
ready.
> And I can ping 192.168.250.10 without problem.

I don't know how the plugin works, but the output looks like it's
self-contradictory - it's okay and then it prints that it has timed
out?!

The only thing I can think is that it's connecting immediately, and then
not getting the greeting from the server within the timeout period.
Either the server's real busy, or it's trying to do a lookup of the
connected IP address (probably 192.168.250.10), and it takes a long time
for it to decide it can't find a hostname for it.

I tested this with netcat and if gets a connection but no welcome
banner, it will print the "Socket timeout after 4 seconds" message, but
it shouldn't print the "SMTP OK" before it.

When you telnet to the internal address, does it respond with the SMTP
banner immediately?


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Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now. 
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_______________________________________________
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Nagios-users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nagios-users
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null