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03.25.2008 at 08:40PM PDT, ID: 23269401
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How to configure ISA firewall/Exchange 2007 SMTP connections to accept from Messagelabs range?
Tags: Microsoft, ISA Server 2006 and Exchange Server 2007, ISA Server 2006 and Exchange Server 2007, How to lock down port 25 / SMTP connections
I have been given a deadline from Messagelabs to configure our firewall and/or email systems port 25/SMTP connections to accept from the existing and new IP ranges specified by Messagelabs.  Our MX records point to Messagelabs servers and they protect us with an antivirus and antispam service.  They cant provide help and their knowledgebase doesn't provide a guide.

We run MS Internet Security and Acceleration Server 2006 on one server and Exchange Server 2007 on another. Local Lan users access mail via MS Outlook and remote home users use Outlook Web Access.
Please describe how to lock down port 25/SMTP connections to accept only from a set of Messagelabs IP ranges. An idiots guide is appreciated. Thanks.

I attach a screencap of our current firewall policy.  I would accept any solution but I have read that it is better to configure just the ISA firewall only?
Attachments:
 
Current firewall policy
Current firewall policy
 
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Question Stats
Zone: Microsoft
Question Asked By: bigleon
Solution Provided By: johan_strange
Participating Experts: 1
Solution Grade: A
Views: 23
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03.25.2008 at 11:24PM PDT, ID: 21209245

Rank: Master

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03.25.2008 at 11:54PM PDT, ID: 21209323

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03.26.2008 at 02:04AM PDT, ID: 21209839

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05.04.2008 at 01:46AM PDT, ID: 21495089

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05.09.2008 at 06:04PM PDT, ID: 21537452

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03.25.2008 at 11:24PM PDT, ID: 21209245

Rank: Master

Hi, You need to publish your Exchange Server through ISA.

http://www.microsoft.com/technet/isa/2006/deployment/exchange.mspx
 
03.25.2008 at 11:54PM PDT, ID: 21209323
Thanks for your comment Johan, but I think I haven't described our situation well enough.
Our email system was deployed by an outside firm and has been functioning well for about a year with no issues.  However Messagelabs require use to lock down port 25 as described above in order to assist Messagelabs in improving their service to us.

I have just found a similar issue here:
http://www.experts-exchange.com/Microsoft/Windows_Security/Microsoft_ISA/Q_23076498.html

The only difference is that I am running ISA 2006 not 2004 and I have not tried setting any access rules or publish rules yet.  I will try this solution now and see what happens.
 
03.26.2008 at 02:04AM PDT, ID: 21209839

Rank: Master

OK I see. I do a similar thing with ML for one of my clients but I lock it down using a Pix rather than ISA. I use ISA 2004 in similar scenarios also and as with 2006 which is Exch 2007 compatable you should be able to change the publishing rule to only allow connections from the ML Cluster only. Other than that as a workaround you could create a perimeter Firewall rule outside of your ISA that will only accept TCP:25 from the specified IP Range.
GL
Accepted Solution
 
05.04.2008 at 01:46AM PDT, ID: 21495089

Rank: Genius

No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I will leave the following recommendation for this question in the Cleanup topic area:
   Accept: johan_strange {http:#21209839}

Any objections should be posted here in the next 4 days. After that time, the question will be closed.

keith_alabaster
EE Cleanup Volunteer
 
05.09.2008 at 06:04PM PDT, ID: 21537452
Forced accept.

Computer101
EE Admin
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628