Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows registry
SYMPTOMS
You configure Kerberos authentication between the front-end
and back-end servers that are running Microsoft Exchange Server 2003. In this
configuration, the following event is logged in the Application log on the
front-end server:Event Type: Warning
Event Source:
EXPROX
Event Category: None
Event ID: 1000
Date:
DateTime:
TimeUser: N/A
Computer:
Front-end_Server_NameDescription: Microsoft
Exchange Server has detected that NTLM-based authentication is presently being
used between this server and server
'
Back-end_Server_Name'. NTLM is still a secure
authentication mechanism and protects users' credentials. However, this
indicates that there may be a configuration issue preventing the use of
Kerberos authentication. If this condition persists, please verify that both
this server and server '
Back-end_Server_Name' are
properly configured to use Kerberos authentication. After applying any changes
it may be necessary to restart Internet Information Services on both the
front-end and back-end servers. As a result the authentication protocol fails
back to NTLM.This event indicates that NTLM authentication is being
used instead of Kerberos authentication between the front-end and the back-end
servers.
For more information about Event ID 1000, visit the Microsoft
Events and Errors Message Center (EEMC) at the following Microsoft Web site:
CAUSE
This problem occurs when you use a disjointed DNS namespace.
For example, in a domain that is named "country.domain.com," you use a
fully-qualified domain name (FQDN) for the front-end server that resembles the
following name:
Feserver.Region1.country.domain.com
In this case, a request is made for a Kerberos token in the
domain "Region1.country.domain.com." However, this domain does not
exist.
RESOLUTION
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
After
you install this hotfix, add the following registry
key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeWEB\DAV
Value
name: DisableRealmHint
Data type: REG_DWORD
Value data: 1
0 and 1 are the only valid values. 0 is off, 1 is on.
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 Exchange Server 2003 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 install Microsoft Exchange Server 2003 Service Pack 2
(SP2) before you apply the hotfix.
For
more information, click the following article number to view the article in the
Microsoft Knowledge Base:
836993
How to obtain the latest service packs for Exchange Server 2003
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 global 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 item in Control Panel.
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| Exprox.dll | 6.5.7651.19 | 415,232 | 22-Apr-2006 | 05:01 | x86 |