You receive an "HTTP 502 Proxy Error - The ISA Server requires a secure channel connection" error message when you install security update MS05-034 for ISA Server 2000 (903236)



The information in this article applies to:

  • Microsoft Internet Security and Acceleration Server 2000

SYMPTOMS

After you install security update MS05-034 for Microsoft Internet Security and Acceleration (ISA) Server 2000, you no longer have outgoing Internet access. In this scenario, you receive an error message that is similar to the following:
HTTP 502 Proxy Error - The ISA Server requires a secure channel connection to fulfill the request. ISA Server is configured to respond to outgoing secure (that is, Secure Sockets Layer (SSL)) channel requests. (12211) Internet Security and Acceleration Server.

CAUSE

This problem occurs if the following conditions are true:
  • You install security update MS05-034 for ISA Server 2000.
  • The Basic authentication option is enabled on the outgoing Web proxy listener.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Internet Security and Acceleration Server 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

You must have ISA Server 2000 Service Pack 2 installed.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date         Time   Version        Size     File name
   ---------------------------------------------------------
   06-Jul-2005  05:19  3.0.1200.431   402,424  W3proxy.exe   
	

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

To work around this problem, you can set the AllowAskBasicAuthOverNonSecureConnection registry entry to a non-zero value. However, this workaround causes ISA Server 2000 to request Basic authentication over HTTP both for incoming Web publishing requests and for outgoing Web proxy requests. We recommend that you use this workaround with caution. For more information about this workaround, click the following article number to view the article in the Microsoft Knowledge Base:

821724 FIX: Basic credentials may be sent over an external HTTP connection when SSL is required

The hotfix that is described in Microsoft Knowledge Base article 821724 prevents a request by ISA Server 2000 for Basic authentication over HTTP. ISA Server 2000 makes this request when you select Basic authentication as the authentication method on the relevant Web proxy listener both for incoming Web publishing requests and for outgoing Web proxy requests.

This hotfix was intended to prevent requests for credentials over HTTP only in Web publishing scenarios. After you apply the hotfix in the Microsoft Knowledge Base article 821724, ISA Server 2000 prevents requests for Basic credentials over HTTP only for Web publishing requests. If you do not require Basic authentication for outgoing Web proxy requests, disable Basic authentication on the outgoing Web proxy listener.

For more information about security update MS05-034, visit the following Microsoft Web site: For more information about how to install ISA Server 2004 hotfixes and updates, click the following article number to view the article in the Microsoft Knowledge Base:

885957 How to install ISA Server hotfixes and updates

For more information about the terms that are used to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates


Modification Type:MinorLast Reviewed:10/12/2006
Keywords:kbQFE kbfix kbbug kbHotfixServer kbpubtypekc KB903236 kbAudITPRO