Microsoft KB Archive/232602

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Article ID: 232602

Article Last Modified on 10/28/2006


  • Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q232602


The Microsoft Exchange Server Message Transfer Agent (MTA) may stop processing messages following disruption of network service and generates events similar to the following:

Event ID: 4284
Category: X.400 Service
Source: MSExchangeMTA
Description: An error has occurred during connection/disconnection. Error code=8511 [POP4 POP4 DOWN 4 179] (14)

Event ID: 4287
Category: X.400 Service
Source: MSExchangeMTA
Description: An internal MTA error occurred. Contact Microsoft Product Support Services. Error code=8640 [POP4 POP4 DOWN4 18] (14)

Event ID: 2035
Category: X.400 Service
Description: Lost connections to locality 0 (BASE POP4 DOWN(6)

Event ID: 1209
Category: X.400 Service
Description: Session error, invalid source LPI on received message. Invalid LPI is 1-16-64 (PLATFORM KERNEL(19) Proc 62)

After network connectivity is restored, the MTA may fail to resume message processing until the MTA service is restarted.


If your Exchange Server computer encounters a network disconnection or disruption while there are messages queued in the MTA for delivery, the MTA may fail to properly recover active associations.

The time interval "n," in seconds, between the logged errors is equal to the number of seconds set in the X.400 Connector. To check this setting, open the property pages of the X.400 Connector, select the Override tab, in the Connection Retry Values frame, and read the Open Interval (sec) setting.

As mail is queued to go across the WAN link, the X.400 Connector attempts to re-establish the connection every n seconds. Because the WAN connection is down, the MTA transport is not available; the MTA is logging these two events.

These errors may also be caused by intermittent network problems such as a WAN connection being temporarily down. This does not necessarily indicate a problem with Exchange Server or the MTA.


To resolve this problem, obtain the latest service pack for Exchange Server version 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack

The English version of this fix should have the following file attributes or later:

Component: Message Transfer Agent (MTA)

File name Version
Dbserver.sch N/A N/A
Ems_rid.dll 5.5.2614.0
Emsmta.exe 5.5.2614.0
Info4log.cfg N/A
Infoblog.cfg N/A
Infodlog.cfg N/A
Infollog.cfg N/A
Infoplog.cfg N/A
Infotlog.cfg N/A
Mtacheck.exe 5.5.2614.0
Mtamsg.dll 5.5.2614.0
P2.xv2 N/A
X400om.dll 5.5.2614.0
X400omv1.dll 5.5.2614.0


Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 3.


After the fix is applied, association recovery should occur as expected and messages should flow after the network is restored.

For additional information, please see the following article in the Microsoft Knowledge Base:

175354 XCON: Repeated Event IDs, 4284, and 4287, Indicate Network Problem

Keywords: kbbug kbfix KB232602