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Postfix Connection Refused Problem

Suse 10.3- Postfix - Connection refused - LinuxQuestions.org

Background:

I recently came across this problem and after searching for hours I still did not get the entire solution in one thread. I eventually resolved the problem using other information picked up from other threads within the Linux Questions site.

I thought i would make it easier to find in one place by posting my solution here.

Problem:

After setting up Postfix and configuring the config files, when trying to access the server on port 25 by telnet to the localhost (127.0.0.1) we gain access to the server. If you telnet to another interface on the same machine for example 192.168.30.x on port 25 you get "Connection refused".

Solution:

Edit file - /etc/postfix/main.cf

Change:
From - #inet_interfaces = all
To - inet_interfaces = all

Change:

From - #mynetworks_style = subnet
To - mynetworks_style = subnet

Change:

From - mynetworks = 127.0.0.0/8
To - mynetworks = 192.168.30.0/24, 127.0.0.0/8
Edit file - /etc/postfix/master.cf
Change:
From - smtp inet n - n - - smtpd
To - 0.0.0.0:smtp inet n - n - - smtpd
Then restart the Postfix server:
/etc/postfix/postfix stop
/etc/postfix/postfix start

I hope this helps.

SuSE Re [SLE] postfix connection refused

From: Anders Johansson (andjoh_at_rydsbo.net)
Date: 04/06/04

  • Next message: Martin Mielke: "[SLE] softphone (SIP) with multiple profiles" 
    To: suse-linux-e@suse.com
Date: Tue, 6 Apr 2004 14:12:24 +0200

    On Tuesday 06 April 2004 07.46, David Rankin wrote:
    > Pierre,
     
    > Apr 6 00:21:49 Nemesis postfix/pickup[8054]: 8618118DA95: uid=0
    > from=<root> Apr 6 00:21:49 Nemesis postfix/cleanup[8153]: 8618118DA95:
    > message-id=<20040406052149.8618118DA95@Nemesis.rbpllc.com>
    > Apr 6 00:21:49 Nemesis postfix/qmgr[815]: 8618118DA95:
    > from=<root@rbpllc.com>, size=306 (queue active)
    > Apr 6 00:21:49 Nemesis postfix/smtp[8155]: connect to
    > mail.3111skyline.com[66.76.63.120]: Connection refused (port 25)
    > Apr 6 00:21:49 Nemesis postfix/smtp[8155]: 8618118DA95:
    > to=<david@3111skyline.com>, relay=none, delay=0, status=deferred (connect
    > to mail.3111skyline.com[66.76.63.120]: Connection refused)

    What do you see in /var/log/mail on skyline when this happens?

    > smtpd_recipient_restrictions = permit_mynetworks,reject_unauth_destination
    > smtpd_sasl_auth_enable = no
    > smtpd_sender_restrictions = hash:/etc/postfix/access

    What is in this file?

    Also, can you get mail to work on other machines/other setups? In other words,
    are you sure it isn't your ISP (or some other upstream firewall) filtering
    port 25? 

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