Cannot access some Web sites with ISA Server 2006.

Posted on 2012-09-03
Last Modified: 2012-09-26
We are running ISA Server 2006 with SmartFilter on a Windows 2003 R2 server.  The ISA server has 3 network interfaces - WAN, LAN, and DMZ wireless.  The LAN users use Web Proxy.  The DMZ wireless users are using NAT.  We are using Captivate software from Collective Computing for the DMZ wireless users so that they have to authenticate.

The Wireless users cannot access certain Web sites - they get an error on the screen "Internet Explorer cannot display the Web page".  We are using IE 8.  It appears that the Web sites are financial in nature -,,, etc.  These same Web sites can be accessed by the Web Proxy users on the LAN subnet.  Does anyone have any idea as to what I have misconfigured.

In looking at the ISA Monitor log, it appears that is trying to hit a UK site, yet NSLookup shows the correct IP for

In looking at the SmartFilter reports from my own testing, it shows that I am hitting the financial sites with no blocks. That would seem to indicate that the display data is not getting back to my screen for some reason.

Does anyone have any ideas as to what I might have incorrectly configured?
Question by:jamesyuen
    1 Comment

    Accepted Solution

    It turns out that the problem was in the config of the Captivate software.  I had to disable a filter in the plugin to resolve the problem.  Nothing was mentioned about this setting in the Captivate user manual.  Captivate Tech Support was very helpful in getting the problem resolved.

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