[nflug] RHEL 5.1/PostFix Refusing Remote Connections

[Robert Meyer]

Make sure that IPTables isn't filtering port 25.  Many installations by default install a firewall package that filters all incoming traffic.  You would expressly have to open any port you wanted the machine to listen on.  Depending on your distribution, you may find /etc/init.d/iptables set up to run when the machine boots.  By default, it installs a block all incoming rule.

Hope this helps...

Cheers!

Bob
 
--
"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return."
   --Leonardo da Vinci

----- Original Message ----
From: Robert Wolfe <robertwolfe at localnet.com>
To: nflug at nflug.org
Sent: Wednesday, December 26, 2007 3:29:59 PM
Subject: Re: [nflug] RHEL 5.1/PostFix Refusing Remote Connections


Erek Dyskant wrote:
> Robert,
>     Your ISP is probably filtering port 25 outside of their network,
 as
> ISPs have had so many problems with open relays sucking up all their
> bandwidth.  Sadly to run a mail server these days one generally needs
 to
> have a dedicated server or a business-class connection these days.
>     Call your ISP to ask what ports they filter, and see if there's
 any way
> you can convince them you know what you're doing (if your ISP is
> localnet you may be in luck <grin>)
>     Best of luck.
>
> --Erek
>   

Actually, if I switch over to my Windoze-based mail server, SMTP
 traffic 
flows just fine over port 25.

--
Robert Wolfe
Systems Administrator
LocalNet Corp.
CoreComm Internet Services
(517) 664-8924

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