Microsoft KB Archive/812848

= ISDN line makes connection to remote WAN sites every 15 minutes =

Article ID: 812848

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange 2000 Server Standard Edition
 * Microsoft Exchange 2000 Enterprise Server
 * Microsoft Exchange Server 2003 Standard Edition
 * Microsoft Exchange Server 2003 Enterprise Edition

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SYMPTOMS
If you have two remote sites in your domain that are connected by an Integrated Services Digital Network (ISDN) line, and the ISDN line is scheduled to make a connection one time per hour, the line may instead make a connection every 15 minutes.



CAUSE
This issue is caused by a DsGetDcName function call. This function returns the name of the primary domain controller (PDC) in a specified domain every 15 minutes. This may generate a Lightweight Directory Access Protocol (LDAP) query to the PDC of the domain. If the PDC is not found on the local site, a connection to a remote site is automatically opened.



RESOLUTION
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 2000 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:

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.

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 tool in Control Panel.

Date       Time        Version     Size        File name -- 12/27/2002 17:52       6.0.6391.0  577,536     Dsaccess.dll



MORE INFORMATION
If you want to use event ID 2080 to diagnose Exchange DSAccess issues and to confirm whether the domain controller is a primary domain controller for its domain, you must add the MinUserDC registry value. For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

298879 Exchange Server 2003 and Exchange 2000 Server may experience performance problems when the PDC emulator is used for DSAccess

316300 Event ID 2080 from MSExchangeDSAccess



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Keywords: kbqfe kbbug kbprb KB812848

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