Re: What's blocking Port 25?
From: John Summerfield (debian_at_ComputerDatasafe.com.au)
Date: 07/30/04
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Date: Fri, 30 Jul 2004 12:48:34 +0800 To: debian-user@lists.debian.org
For starters:
See what addresses exim is listening to
lsof -c exi -a -i
If that checks out. from outside, see what really happens:
telnet Griff.example.com 25
If that checkes out, from outside
host -t mx Gruff.example.com
Griffin Palmer wrote:
>This may be one for the firewalls list, but I'm not
>entirely sure this is a firewall issue, or, at least,
>*entirely* a firewall issue. I'm pretty sure it's not
>an exim issue.
>
>I thought I'd see if there are any troubleshooting
>suggestions from this obviously very experienced user
>base, before trying more specialized lists.
>
>I've just installed testing/unstable on my machine.
>
>I'm running behind a NAT DSL router, with iptables on
>my machine.
>
>I have my own domain, running its own DNS, smtp host,
>http host, etc.
>
>I'm using exim 4.41, compiled from source, as my MTA.
>
>I was earlier running exim 3.36-11 on another box,
>behind the same router, using identical port
>forwarding. But in the fresh install on more robust
>hardware, something has gone amiss.
>
>I'm pretty sure it's not exim. All the diagnostics
>check out for exim. I can send from and reply to
>local-domain addresses, using either mutt or mail.
>
>I can also send messages to the outside world. But
>replies (or original messages) from the outside world
>fall on deaf ears. Eventually, I get an "I've given up
>trying" message from my ISP's MTA -- except in one
>instance (more on that below).
>
>Here's where it gets confusing. Running nmap against
>my machine from outside the domain shows it is
>answering that Port 25 is closed. This even though,
>using FireStarter, I've explicitly opened Port 25.
>
>I'm *certain* I've properly forwarded Port 25 to the
>correct IP address for my new machine.
>
>Here's another oddity: Even though my machine replies
>'closed' to Port 25 scans, I got one error reply with
>one message attempt from my ISP account that suggests
>the port isn't *entirely* closed.
>
>Thinking I might have DNS configuration problems, I
>tried sending a message to myself@123.457.789.012 (my
>user name and IP address substituted for this dummy
>address). I didn't realize at the time you had to
>configure exim to accept mail addressed in this
>fashion.
>
>I got an error message back informing me that exim had
>refused to forward the dotted-quad-addressed message
>to my account on my host.
>
>So it seems as if *something* is getting through on
>Port 25.
>
>It doesn't seem, though, that it's a matter of
>messages reaching my host and then exim failing to
>properly forward them locally: There are no
>unforwarded messages languishing on exim's input
>queue.
>
>Any troubleshooting ideas would be appreciated.
>
> Griff Palmer
>
>
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-- Cheers John -- spambait 1aaaaaaa@computerdatasafe.com.au Z1aaaaaaa@computerdatasafe.com.au Tourist pics http://portgeographe.environmentaldisasters.cds.merseine.nu/ -- To UNSUBSCRIBE, email to debian-user-REQUEST@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
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