I am not sure if this helps, but I had a similar problem with the latest
build of m0n0wall.
Basically I lost access to an external mail server on port 25 (not blocked
by the ISP) and the only way I could fix it was to rebuild my m0n0wall and
then everything returned to normal.
It was bizarre as I never put any rules in my m0n0wall to block SMTP, I only
ever put in a rule to allow it to my DMZ.
I still have no idea why m0n0wall dropped this nor could I find anything in
any log saying it was blocked.
On 10/22/06, Vadim Pushkin <wiskbroom at hotmail dot com> wrote:
> Thanks guys, but my problem is getting outbound connections to other smpt
> servers. I am testing by telnetting to another host on port 25. I am not
> getting connected from one particuliar machine only, and it has no selinux
> running. I have another windoze box that this does work for. This
> after I created a nat rule, which I've since removed. I am not sure if
> perhaps a remnant of this rule is hosing me somehow, which is why I need
> know how to clean nat cache or something else.
> Thanks all,
> >Lee Sharp wrote:
> > > On Sat, 2006-10-21 at 00:58 +0000, Vadim Pushkin wrote:
> > >> Hello;
> > >>
> > >> I've been using monowall for my home for quite some time, now I wish
> > >> it for bigger things but I am baffled as to why I am unable to get
> > >> smtp from inside my LAN. I have very simple rules and setup.
> > >>
> > >> My internal network is 192.168.1.0, my m0n0 box is 192.168.1.1
> > >
> > > Many ISPs filter smtp. That is most likely your problem, as I am
> > > running mail servers behind many m0n0walls.
> >Many ISPs who think they are smart block port 25, but do not understand
> >that port is for MTA (Mail Transport Agent) use to move message.
> >The port to inject a message into the system is the "submission
> >services" port, which is 587. Try setting that as your SMTP port.
> >Works on my ISP, which blocks inbound 25, but not 587.
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