RE: Troubles getting SMTP thru ISA
- From: "Nick Chadwick" <nc@xxxxxxxxxxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Mon, 29 Oct 2001 15:46:48 -0000
Assuming your mail server is running on the ISA machine, you need three
packet filters: the DNS filter, one for outbound SMTP (TCP, outbound,
remote port fixed 25), and one for inbound SMTP (TCP, inbound, local
port fixed 25).
Nick Chadwick
Technical Consultant
ASYST International
Tel: +44-(0)20-7976-7545 Fax: +44-(0)20-7976-7546
Email: nc@xxxxxxxxxxxxxxxxxxxxxxx <mailto:nc@xxxxxxxxxxxxxxxxxxxxxxx>
Web: http://www.asyst.co.uk
> -----Original Message-----
> From: Alin Selicean [mailto:alin_selicean@xxxxxxxxx]
> Sent: 28 October 2001 15:05
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Troubles getting SMTP thru ISA
>
>
> http://www.ISAserver.org
>
>
> Hi, Folks !
>
> I have an Exchange 5.5 SP4 behind an ISA Server and I want to
> filter out
> all the packets that passes through ISA Server. Therefore, I
> activated IP
> Packet Filtering and created filters for SMTP packets on port
> 25. As for
> the DNS traffic, I am relying on the default created DNS filter, which
> seems to work fine.
>
> But somewhere I missed something. I am not able to send and receive
> anymore email messages after I activated packet filtering. If I'm
> deactivating completely the IP Pacjet Filtering option, mail
> is arriving
> and can be sent out with no problems.
>
> Can anyone help me out with this ? I don't have much experience in
> filtering out packets and I don't know exactly which type of traffic,
> excluding DNS and SMTP needs to be allowed to pass in order to have a
> functional email system.
>
> Thank you in advance.
>
> Regards,
> Alin
>
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