Microsoft KB Archive/817051

= Microsoft Exchange IMAP4 service stops responding on a heavily loaded server =

Article ID: 817051

Article Last Modified on 2/20/2007

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APPLIES TO


 * Microsoft Exchange 2000 Server Standard Edition

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SYMPTOMS
On a heavily loaded Exchange 2000 server, you may experience one or more of the following symptoms:
 * The Microsoft Exchange IMAP4 service may stop responding to client requests.
 * The Microsoft Exchange EXIPC (Epoxy) Blocks Allocated performance monitoring counter for the IMAP instance increases from 0 (zero) to 100,000 in a short time (typically, less than 10 minutes). After continued heavy usage (stress), the counter increase again (typically from 100,000 to 200,000 in less than 10 minutes).
 * If you try to restart Microsoft Windows, the Exchange IMAP4 service stops responding.
 * An Access Violation (AV) occurs in the Inetinfo.exe file process.



CAUSE
This problem may occur if the Epoxy queue becomes full, for example, when many IMAP clients browse through a heavily populated public folder list.

The code that determines when the Epoxy queue is full incorrectly determines this state, so that a full queue condition is not detected.



Cumulative Rollup Information
To resolve this problem, obtain the September 2003 Exchange 2000 Server Post-Service Pack 3 (SP3) Rollup. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

824282 September 2003 Exchange 2000 Server Post-Service Pack 3 Rollup

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 2000 Server service pack that contains this hotfix.

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, 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 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 -- 21-Mar-2003 21:11  6.0.6444.0  733,184  Epoxy.dll

Note Because of file dependencies, this update requires Exchange 2000 Server Service Pack 3 (SP3).

For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

301378 How to Obtain the Latest Exchange 2000 Server Service Pack



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
For additional information about the Exchange Server Epoxy component, click the following article number to view the article in the Microsoft Knowledge Base:

260995 XCON: Definitions of Key Transport Components in Exchange 2000 Server

Additional query words: kbExchange2000preSP4septbarFix XADM

Keywords: kbhotfixserver kbqfe kbqfe kbfix kbexchange2000presp4fix kbbug KB817051

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