Select the product you need help with
- Internet Explorer
- Windows Phone
- More products
ISA Server 2006 sends back an HTTP 502 error if invalid credentials are provided to an FBA Web listener
Article ID: 958952 - View products that this article applies to.
Consider the following scenario:
For example, the following two kinds of clients may encounter this problem under certain conditions:
In the scenario that is described in the "Symptoms" section, ISA Server 2006 falls back to use basic authentication for the non-browser client, such as ActiveSync or Outlook Anywhere Autodiscovery. This problem occurs because ISA 2006 SP1 incorrectly handles the authentication message when FBA switches to basic authentication and the wrong credential is provided by client.
To resolve this problem, apply the hotfix that is mentioned in the following Microsoft Knowledge Base article:
(http://support.microsoft.com/kb/959357/ )Description of the ISA Server 2006 hotfix package: October 29, 2008
To work around this problem, set up a dedicated Web listener for the ActiveSync client or for the Outlook Anywhere client, and then configure the Web listener by using basic authentication instead of FBA.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
956192For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/956192/ )An Outlook Anywhere client continually uses the wrong credentials every time that it tries to authenticate itself on an Exchange server after you install ISA Server 2006 Service Pack 1
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates
Article ID: 958952 - Last Review: February 26, 2009 - Revision: 1.0