Messages are queued, and message delivery is delayed in an Exchange 2000 Server organization (909955)

SYMPTOMS

After you apply hotfix 826948, you may experience the following symptoms in a Microsoft Exchange 2000 Server organization:

Messages are queued in the Messages with an unreachable destination queue.
Messages are queued in other queues. Additionally, message delivery is delayed.

Additionally, the following event is logged in the Application event log:Event ID : 4000
Category : Connection Manager
Source : MSExchangeTransport
Type : Warning
Description : Message delivery to the remote domain "XXXXXX" failed for the following reason:Note "XXXXXX" is an alphanumeric string that varies depending on the name of the remote routing group. The reason for the message delivery failure is not logged.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, 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:

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

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

No prerequisites are required to apply the hotfix.

Restart requirement

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

File name	File version	File size	Date	Time	Platform
Phatq.dll	6.0.6617.99	507,904	10-Dec-2005	04:03	x86

MORE INFORMATION

This problem may occur when the following conditions are true:

The servers that are running Exchange 2000 Server have version 6.0.6516 or a later version of the phatq.dll file installed.
The Exchange 2000 Server servers are deployed in a complex mesh topology.
The Exchange 2000 Server servers are connected by using site connectors.

In this scenario, the link state is frequently disrupted. Frequent disruption causes unnecessary message rerouting and delayed message delivery.