Date: Thu, 11 Sep 2008 16:18:07 -0500 From: CyberLeo Kitsana <cyberleo@cyberleo.net> To: Andrew Falanga <af300wsm@gmail.com> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: mail server DNS configuration questions Message-ID: <48C98B0F.6000803@cyberleo.net> In-Reply-To: <48C87517.8020908@gmail.com> References: <200809061928.28539.af300wsm@gmail.com> <20080907034834.GB37461@shepherd> <48C87517.8020908@gmail.com>
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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 <CyberLeo@CyberLeo.Net> Furry Peace! - http://wwww.fur.com/peace/
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