From owner-freebsd-questions@FreeBSD.ORG Thu Sep 11 21:18:12 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id C4067106564A for ; Thu, 11 Sep 2008 21:18:12 +0000 (UTC) (envelope-from cyberleo@cyberleo.net) Received: from mtumishi.cyberleo.net (mtumishi.cyberleo.net [69.72.129.14]) by mx1.freebsd.org (Postfix) with ESMTP id A17C88FC1A for ; Thu, 11 Sep 2008 21:18:12 +0000 (UTC) (envelope-from cyberleo@cyberleo.net) Received: from [172.16.44.14] (adsl-75-4-161-142.dsl.emhril.sbcglobal.net [75.4.161.142]) by mtumishi.cyberleo.net (Postfix) with ESMTPSA id 85BCC11748; Thu, 11 Sep 2008 17:18:10 -0400 (EDT) Message-ID: <48C98B0F.6000803@cyberleo.net> Date: Thu, 11 Sep 2008 16:18:07 -0500 From: CyberLeo Kitsana User-Agent: Thunderbird 2.0.0.16 (X11/20080726) MIME-Version: 1.0 To: Andrew Falanga References: <200809061928.28539.af300wsm@gmail.com> <20080907034834.GB37461@shepherd> <48C87517.8020908@gmail.com> In-Reply-To: <48C87517.8020908@gmail.com> X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "freebsd-questions@freebsd.org" Subject: Re: mail server DNS configuration questions X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Sep 2008 21:18:12 -0000 Andrew Falanga wrote: > ... > While diagnosing this, I connect to the server (using Putty) from a > machine in PN1, using either a mail client or telnet I'm unable to make > a connection to the mail server over port 25. Using tcpdump during this > putty session I do not even see the SYN packets for the start of the > connection from the machines in PN1. This is only when connecting to > port 25. Obviously, I can connect to the server because I'm using > ... Are you sure CableOne does not filter outgoing port 25 connection attempts to any servers save it's own relay? My ISP (A big name DSL provider; grep the headers if curious) does not perform incoming port filtering, but rather aggressively filters outbound TCP port 25 and (for reasons unexplained) 4444 as well. -- Fuzzy love, -CyberLeo Technical Administrator CyberLeo.Net Webhosting http://www.CyberLeo.Net Furry Peace! - http://wwww.fur.com/peace/