Re: [cobalt-users] Mail Exchange in DMZ

["Jeff Jensen" <jeff@xxxxxxxxxxxxxxxxx>]

The problem is located. The problem was in the firewall.

Thank you for the help.

Jeff

----- Original Message -----
From: "Colin J. Raven" <cjraven@xxxxxxxxxxx>
To: <cobalt-users@xxxxxxxxxxxxxxx>
Sent: Sunday, April 08, 2001 7:35 PM
Subject: Re: [cobalt-users] Mail Exchange in DMZ


> On Sun, 8 Apr 2001, Jeff Jensen wrote:
>
> > To answer Colins questions:
> >
> > a) The DNS is hosted by a 3rd party.
> > b) The two Raqs are two seperate domains, they don't have anything to do
> > with one another.
> >
> > I just tried from another machine in the DMZ (NT box) to look up the
main
> > site on each of the RAQs in a browser. I can see the correct external IP
is
> > resolved but the browser also times out after a while.  So it's not just
a
> > mail problem. So I think it's a firewall problem.
>
> Jeff, *please* (please!) bottom-post from now on? You're likely to run
> into some noise if you don't. Advice only.
>
> A few basic steps:
> 1. Can you ping each box from outside the firewall?
>
> 2. Can you (again from the outside) ssh/telnet to the boxen (which ports
> are blocked is where I'm going here) specifically, can you;
> telnet to ports 80 (http) 25, 110 and any other ports which you believe to
> be open?? and to *either* or *both* boxen????
>
> 3. Can you do any/all of the above from inside your firewall as well?
>
> 4. Are "A" and "MX" records set up properly for each machine at your DNS
> provider?
>
> 5. Do you have access to your firewall ruleset(s)...if yes, don't post
> 'em, but see if you can figure out what the firewall vendor put in there.
>
> You may have done some/all of these, but from bitter experience I've found
> that if you stare at a problem for a long time it often becomes more, not
> less complex.
>
> I'm no firewall guru, but the last one I set up taught me a lot
> of basic steps towards solving problems like this one...or at least a
> decent start point.
>
> Regards,
> -Colin
> --
> Colin J. Raven
> Linux Registered User #82296
> Sun Apr  8 13:34:01 EDT 2001
>   1:34pm  up 39 days, 17:05,  5 users,  load average: 1.09, 0.98, 0.01
>
>
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