E-mail messages are blocked after you set the value of the FIPSAlgorithmPolicy registry entry to "1" on a server that is running Exchange Server 2003

Symptoms

In a Microsoft Exchange Server 2003 environment, you can require that Transport Layer Security (TLS) authentication is used for incoming connections. To do this, you configure the authentication settings on a virtual server. However, if you deploy a TLS connection between two Exchange organizations, and you set the value of the FIPSAlgorithmPolicy registry entry to "1," you find that the messages are blocked between the two Exchange organizations. For example, the messages to the remote domain remain in the queue and are not sent.

Note The FIPSAlgorithmPolicy registry entry is located under the following registry subkey on the server that is running Exchange Server 2003:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\LSA

Resolution

Hotfix information

A supported hotfix is 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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

This hotfix requires Exchange Server 2003 Service Pack 2 to be installed on the server because of file dependencies.
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 this hotfix. However, the Internet Information Services (IIS) Admin Service and all dependent services are restarted automatically when you apply this 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 item in Control Panel.
The Exchange server is hosting on a Windows Server 2003 with SP1, x86-based operating system
File nameFile versionFile sizeDateTime
Smtpsvc.dll6.0.3790.3235483,84025-Oct-200822:34
The Exchange server is hosting on a Windows Server 2003 with SP2, x86-based operating system
File nameFile versionFile sizeDateTime
Smtpsvc.dll6.0.3790.4398483,84025-Oct-200822:47

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Properties

Article ID: 957047 - Last Review: Jan 9, 2015 - Revision: 1

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