Check_NRPE Connectivity Issues

[Chris Miller]

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I am using check_nrpe to connect to a remote box and run a check
command. I am able to telnet to the box on port 5666 and get an open
connection, but when I try to run check_nrpe (either via Nagios or just
from CLI), I get: "CHECK_NRPE: Socket timeout after 10 seconds."

I know it works because I have it checking other machines running NRPE
too, with the exact same configuration.

On the remote machine, I am getting this in /var/log/messages: "Could
not read request from client, bailing out..."

All of the machines that run nrpe are FreeBSD 5.4 and FreeBSD 6.0 (this
one is 6.0).

I am able to run the check_nrpe command from the local box and I get
"OK" returned just fine. I have NRPE bound to the correct IP address --
the one I am checking from the remote host.

The only difference in configuration between the host that I'm getting
the errors on and the other machines that also run NRPE without any
issue is that the Nagios server is behind a NAT (running static NAT).
The other servers running NRPE are also behind the same NAT, so I
connect to them using the 10.x.x.x address. On the machine I am having
problems with, it is located on the other side of the NAT (I connect to
its public IP). The machine having issues is *not* behind a NAT its
self, so I only traverse the NAT on the way *out* from the Nagios
server. Since it runs over TCP, I would think it should work just fine
as the connection state would be maintained in the NAT.

What am I missing here? I'm also certain it's something in the NAT, was
just wondering if there is anything special I have to do. The NAT is a
Cisco PIX.

- --

Thanks,

Chris Miller
ServerMotion
www.servermotion.com
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