timeouts from one machine and not another

[Demetri Mouratis]

On Tue, 6 Jul 2004, David Bishop wrote:

> I have two nagios servers checking basically the same machines (we don't
> need no stinking failover).  However, from one machine (A), I get a lot of
> time-out errors on certain machines (it times out when checking smtp and
> ftp) and on the other, I don't.  If I try it from the command-line (just
> telnetting to the ports), it hangs for a long time (long being greater
> than 10 seconds) but finally connects.  However, connecting to the same
> machine from B, it's instantaneous.  Normally I'd suspect the network
> connection between the two machines (client and A), but a reverse
> connection works very quickly (connecting to A's smtp port), and they
> are both on underutilized 1.5Mb lines.  Ping time between them (either
> way) averages slightly over 100ms. The only real difference that I can
> think of between A and B is that A is running FreeBSD 5.2.1 and B is
> Debian/Sid.  The clients are all also running Debian (if that matters).
>
> Help, please :-(
>

Check to see whether machine A is properly configured in reverse DNS.
---------------------------------------------------------------------
Demetri Mouratis
dmourati at linfactory.com



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