Re: Intermittent inbound delivery to Exchange
- From: "Tom Geairn" <tgeairn@xxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 11 Jan 2006 15:51:32 -0600
This also sounds like it could be a problem with what addresses SMTP & ISA
are listening on. If you stop IIS (and therefore SMTP) on the ISA server,
then do a "netstat -a -n" do you see anything listening to port 25 (assuming
you're using 25 throughout) on the internal NIC? If ISA (or anything else)
starts listening on 25, SMTP won't be able to. This leaves the messages
queuing.
-Tom Geairn
NewView Consulting, LLC
"JohnMN" <johndotneedelman@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:I5exf.697931$_o.618359@xxxxxxxxxxxx
>I am hoping to get some ideas about what may be causing an intermittent
> problem. My thought is the SMTP filer is corrupt. Any ideas or a way
> to prove my hypothesis would be appreciated. Thanks
>
> The problem:
> On an intermittent basis, the SMTP virtual server on ISA 2004 fails to
> forward mail to the internal Exchange 2003 server on Windows 2003.
> There is no problem with outbound mail; it does not pass through the
> SMTP filter on the ISA 2004 server. When mail fails to forward, the
> queue fills on the ISA Server. To get mail forwarding again all I have
> to do is restart IIS on the ISA server and it properly delivers all its
> messages to the internal Exchange. When a Publishing rule is in place
> on the ISA server delivering directly to Exchange, bypassing the STMP
> virtual server on ISA, there are no intermittent delivery issues. The
> only evidence I can find of something wrong is a warning in the System
> Event Log for the SMTPSVC event id 4006 "Message delivery to the host
> '192.168.0.3' failed while delivering to the remote domain
> 'company.com' for the following reason: The connection was dropped by
> the remote host." This shows up once about every hour give or take.
>
> The environment:
> Windows 2003 SP1 Standard DC, Windows 2003 SP1 Standard Exchange 2003
> SP2 Standard, and Windows 2003 SP1 Standard ISA 2004 SP1 Standard. The
> ISA server has 3 nics internal, external and a secured wireless
> segment. There is an Access Rule for SMTP from internal to external
> and a SMTP server publishing rule for the internal interface, which
> hosts the virtual SMTP server. ISA's SMTP Filter is set to filter on a
> few key words and a list of file extensions. All inbound mail comes
> through the STMP Filter on the ISA server; there is a remote domain
> entry with the internal Exchange server listed as the forward to smart
> host. The Exchange server sends mail directly to the ISP's smart host.
> All servers use an internal DNS on the DC, this includes the ISA
> server. DNS has the ISP's DNS servers as forwarders, and there is an
> Access Rule on the ISA server allowing DNS out. External DNS
> resolution for the domain and mail is on a third party host.
>
> --
>
.
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