Microsoft KB Archive/840882

= Windows XP discards messages that are sent by using HTTP after encountering an ISA Bug =

Article ID: 840882

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Message Queuing 3.0

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SYMPTOMS
Message Queuing messages may be silently discarded by the receiver. The problem occurs when the messages are sent by using the HTTP protocol and if the messages are sent through a Microsoft Internet Security and Acceleration (ISA) Server.

You can find the following entry in the Internet Information Services (IIS) log files:

2004-04-15 18:57:46 W3SVC1 MSMQSERVER 10.10.10.1 OST /msmq/private$/inbox - 80 - 128.128.128.1 HTTP/1.0 - - - - 200 0 0 157 9962 15

Note POST has been truncated to OST.



CAUSE
A problem in ISA Server 2004 may cause the receiver of a Message Queuing HTTP message to receive the POST command without the letter P. This command now reads as an &quot;OST&quot; command. Therefore, the receiver returns error 501 that means &quot;not implemented&quot; and then discards the message. The default handling of error 501 was changed from drop to retry. Therefore, the HTTP message that hits the ISA problem is re-sent. The second message is always successful because the ISA bug occurs only when two subsequent POST requests are sent without waiting for a reply in the middle.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
No prerequisites are required.

Restart Requirement
You must restart your computer after you apply this hotfix.

File Information
The English version of this has the file attributes (or later) 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 --  26-Apr-2004  23:11  5.1.0.1043         67,456  Mqac.sys 27-Apr-2004 00:35  5.1.0.1043        130,048  Mqad.dll 27-Apr-2004 00:35  5.1.0.1043         44,032  Mqdscli.dll 27-Apr-2004 00:35  5.1.0.1043         14,848  Mqise.dll 27-Apr-2004 00:35  5.1.0.1043        608,768  Mqqm.dll 27-Apr-2004 00:35  5.1.0.1043        165,888  Mqrt.dll 27-Apr-2004 00:35  5.1.0.1043         88,576  Mqsec.dll 27-Apr-2004 00:35  5.1.0.1043         44,544  Mqupgrd.dll 27-Apr-2004 00:35  5.1.0.1043        467,456  Mqutil.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

This problem was first corrected in Microsoft Windows XP Service Pack 2.

