Windows XP discards messages that are sent by using HTTP after encountering an ISA Bug (840882)

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 "OST" command. Therefore, the receiver returns error 501 that means "not implemented" 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.

RESOLUTION

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

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

REFERENCES

For additional information about how software update packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915 New file naming schema for Microsoft Windows software update packages