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In a Windows 2000 domain, earlier clients such as Windows NT 4.0 may not successfully join the domain, or users cannot successfully change their domain passwords from these clients. Users who try to change their passwords may receive the following error message:
This behavior typically occurs when there is a lot of activity on the Windows 2000 primary domain controller (PDC) emulator for that domain. If you have the netlogon logging feature turned on, you may receive many "(Discarded as too old.)" messages in the log.
Unable to change password on this account (C00000BE).
This behavior occurs because the PDC emulator is too busy to answer these requests within the 10-second time limit and the packets are discarded. In some cases, the PDC emulator cannot service the request because it loses the name-to-internet protocol (IP) mapping of the client.
Netlogon maintains a temporary table that maps client names to their IP addresses. This table caches the entries for only 5 seconds from the initial request. If the PDC emulator does not service the request within 5 seconds, it must search for the client name again. Depending on your name resolution configuration this may take several seconds. Therefore this request may be dropped when the search takes longer than 10 seconds.
The long time it takes to resolve names may cause a large backup of requests to drop at the same time. To resolve this behavior, change the cache timeout value to 15 seconds. If you do so, you do not have to use external name resolution when you process these requests.
Service Pack InformationTo resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/260910/EN-US/ )How to Obtain the Latest Windows 2000 Service Pack
Hotfix InformationA 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 this specific problem.
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, submit a request to 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:
http://support.microsoft.com/contactus/?ws=supportNote 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. The English version of this fix has the file attributes (or later) 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 ------------------------------------------------------------ 16-Mar-2002 02:33 5.0.2195.5080 20,752 Nbtstat.exe 08-May-2002 22:25 5.0.2195.5758 144,144 Netbt.sys
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows 2000 Service Pack 4.
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/265173/EN-US/ )The Datacenter Program and Windows 2000 Datacenter Server Product
Article ID: 316803 - Last Review: February 27, 2014 - Revision: 4.7