[lug] SMTP mail thru firewall

[George Sexton]

Yes, I have seen this also. I could never send Email from an NT machine to a
certain domain. I wrote a simple NT Auth/identd daemon as a service, and the
problem totally disappeared.

George Sexton
MH Software, Inc.
Voice: 303 438 9585
http://www.mhsoftware.com


> -----Original Message-----
> From: lug-admin at lug.boulder.co.us [mailto:lug-admin at lug.boulder.co.us]On
> Behalf Of Bonnell, Doug
> Sent: Wednesday, July 12, 2000 10:58 AM
> To: 'lug at lug.boulder.co.us'
> Subject: RE: [lug] SMTP mail thru firewall
>
>
> I don't know if my experience is applicable, but I started getting delays
> when
> sending out Email after installing a router/firewall. My ISP uses FreeBSD
> with
> an smtp server that attempts authentication on port 113.
>
> This communications on port 113 doesn't occur, to the server sits in a
> timeout
> loop for about 30 seconds before deciding to accept the mail.
>
> Could it be that your smtp server is attempt the authentication
> via port 113
> and
> then rejecting the connection when the timeout occurs?
>
> Hope this helps...
>
> Doug Bonnell
> Software Engineer
> BreeceHill Technologies Inc.
>
> > -----Original Message-----
> > From:	Justin [SMTP:glowecon at netscape.net]
> > Sent:	Wednesday, July 12, 2000 10:06 AM
> > To:	BLUG
> > Subject:	[lug] SMTP mail thru firewall
> >
> > Well I tried changing my MASQ line to not include the '-i
> $INTERFACE' part
> > and
> > I still couldn't get my smtp mail to go out. I can, however,
> see the mail
> > msg
> > hitting my mail server but the maillog shows the connection timing out:
> >
> > Jul 11 23:35:54 localhost postfix/smtpd[9013]: connect from
> > ns2.mydomain.com[63.228.xx.xx]
> > Jul 11 23:35:54 localhost postfix/smtpd[9013]: 50F5A57BFE:
> > client=ns2.mydomain.com[63.228.xx.xx]
> > Jul 11 23:40:59 localhost postfix/smtpd[9013]: timeout after DATA from
> > ns2.mydomain.com[63.228.xx.xx]
> > Jul 11 23:40:59 localhost postfix/smtpd[9013]: disconnect from
> > ns2.mydomain.com[63.228.xx.xx]
> >
> > ns2 being the machine with the firewall and the clients behind it. This
> > error
> > happened whether or not I included the -i $INTERFACE part of my the MASQ
> > entry. One interesting thing is that when the internal interface on teh
> > firewall box is in promiscuous mode, the mail shoots right
> thru. Not sure
> > what
> > that means exactly...any other thoughts?
> >
> > Justin
> >
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