From: Larry Eckert (eckert@hanover.edu)
Date: Thu Oct 23 2003 - 17:04:38 CDT
I am setting up some linux firewall boxes (to make some gig firewalls and
save money) (running Linux 2.4.20 Slackware 9.0 using iptables). I set up a
private network behind the firewall, and I have them working with
everything on the network (web, dns, ssh, ...), but for some reason, they
are not working with our mail server. When I run Outlook Express or Eudora
(another email app) on the private network (behind the firewall), they will
send and receive mail, but then they get stuck in trying to "close
connection with mail server", then eventually they timeout and say that
they couldn't close the connection. This led me to believe that I was just
missing a rule or two (in addition to accepting POP3 and SMTP), so I set up
some logging to look at the dropped traffic, but found nothing. So I
decided to simply change the FORWARD rule to ACCEPT everything, and it
didn't make a difference. Which makes me believe that the iptables rulesets
aren't the issue. Everything else gets forwarded to the private network
(and vice-versa) just fine, but for some reason these mail apps aren't
working (completely...). This makes me believe that it isn't a port I am
missing on my rules, but some module or something else that I obviously
don't know that I need. I am just curious if there is some module or
something I need to install on the linux box to allow this to happen, or if
it is something on the mail server that I need to setup (it is a Sun
Solaris box running iPlanet). I really am clueless on why everything else
will work (especially when I ACCEPT everything), but this little thing with
the mail apps won't work.
I would appreciate any help, or suggestions on where to even look (email
server, linux box, help sites ....anything), or any recommendations if any
of you have set something like this up before.
Thanks,
Larry Eckert
Network Systems Specialist
Hanover College
(812) 866-6838
eckert@hanover.edu
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