Bizarre network/routing problem

[John Abreau]

I've got a linux box with a web server that I can't access properly since
this morning. It's at a colocation site, behind a PIX firewall with a
static conduit to it on port 80.

I've got two subnets at the site, with several machines on either side. Of
the four web servers on the PIX's inside subnet, I can access three from
anywhere (telnet ipaddr 80), but the fourth I can only access from the
subnet inside the PIX and the subnet immediately outside the PIX.

I checked the routing tables and ifconfig settings, and there's no
differences between the machines (aside from the ip and mac addresses, of
course). The static conduits for the four machines appear to be configured
identically on the PIX (I telnetted to the PIX and did a "write term" to
get a dump of its current settings). I'm waiting for a couple of our guys
to arrive at the colocation site to reboot the PIX, just in case the
settings I'm seeing don't reflect its current behavior.

This behavior doesn't make sense to me. I can't think of anything that
would break this one server but not affect the other three identical
servers.

What could I be overlooking?

--
John Abreau / Executive Director, Boston Linux & Unix 
ICQ#28611923 / AIM abreauj / Email jabr at blu.org

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