DOCUMENT:Q185694  08-MAY-2002  [exchange]
TITLE   :Thread Deadlock When Windows NT Backup Is Stopped
PRODUCT :Microsoft Exchange
PROD/VER:winnt:4.0,5.0,5.5
OPER/SYS:
KEYWORDS:kbExchange500preSP3fix

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Exchange Server, versions 4.0, 5.0, 5.5 
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SYMPTOMS
========

When you are running a backup using the Windows NT Backup program against a
Microsoft Exchange Server computer, if the backup is stopped before the backup
completes, Windows NT Backup stops responding (hangs).

CAUSE
=====

When a backup is stopped, the closing procedure blocks infinitely, waiting on a
thread's handle to close. The thread handle is never closed, so Windows NT
Backup stops responding.

RESOLUTION
==========

Exchange Server 5.5
-------------------

To resolve this problem, obtain the latest service pack for Microsoft Exchange
Server version 5.5. For additional information, please see the following article
in the Microsoft Knowledge Base:

   Q191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack


Exchange Server 5.0
-------------------

A supported fix is now available from Microsoft, but it is only intended to
correct the problem described in this article and should be applied only to
systems experiencing this specific problem. This fix may receive additional
testing at a later time, to further ensure product quality. Therefore, if you
are not severely affected by this problem, Microsoft recommends that you wait
for the next Microsoft Exchange Server 5.0 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services
to obtain the fix. For a complete list of Microsoft Product Support Services
phone numbers and information about support costs, please go to the following
address on the World Wide Web:

   http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal support costs will apply to additional
support questions and issues that do not qualify for the specific update in
question.

The English version of this fix should have the following file attributes or
later:

Component: Exchange Database Engine

+---------------------------+
| File name   | Version     | 
+---------------------------+
| Edbbcli.dll | 5.0.1461.31 | 
+---------------------------+



Exchange Server 4.0
-------------------

A supported fix is now available from Microsoft, but it is only intended to
correct the problem described in this article and should be applied only to
systems experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the
fix. For a complete list of Microsoft Product Support Services phone numbers and
information on support costs, please go to the following address on the World
Wide Web:

   http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal support costs will apply to additional
support questions and issues that do not qualify for the specific update in
question.

The English version of this fix should have the following file attributes or
later:

Component: Exchange Database Engine

+-------------------------+
| File name   | Version   | 
+-------------------------+
| Edbbcli.dll | 4.0.997.1 | 
+-------------------------+



STATUS
======

Exchange Server 5.5
-------------------

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version
5.5. This problem was first corrected in Microsoft Exchange Server Service Pack
1.

Exchange Server 5.0
-------------------

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version
5.0.

Exchange Server 4.0
-------------------

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version
4.0.

Additional query words: hang abort

======================================================================
Keywords          : kbExchange500preSP3fix 
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2
Version           : winnt:4.0,5.0,5.5
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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Copyright Microsoft Corporation 2002.