DOCUMENT:Q283903  08-MAR-2001  [exchange]
TITLE   :XADM: Event ID 8512 Logged by Exchange Server Information Store
PRODUCT :Microsoft Exchange
PROD/VER::5.5
OPER/SYS:
KEYWORDS:kberrmsg exc55

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The information in this article applies to:

 - Microsoft Exchange Server, version 5.5 
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SYMPTOMS
========

An Exchange Server computer may periodically generate the following event ID
8512 error message (which indicates that error 3034 occurred) in the Application
event log:

   Event ID: 8512
   Source: MS ExchangeIS priv
   Category: MTA Connections
   Type: Warning
   Description:
   Unable to connect to the MTA consecutive ma-open calls are failing with error
   3034.

   There is not enough memory to complete the operation.

CAUSE
=====

This issue occurs because the Exchange Server information store process creates
threads to use when sending and receiving mail from the Exchange Server message
transfer agent (MTA). The number of threads that are created is determined by a
number of registry values, and these registry values are ordinarily set based on
adjustments that are made when you run the Exchange Server Performance Optimizer
(Perfwiz).

If these registry values are set manually to values that exceed 40 when the
values are added together, the information store generates the event ID 8512
error message (which indicates error 3034) in the "Symptoms" section of this
article.


RESOLUTION
==========

To resolve this issue, run Performance Optimizer to reset the registry values to
values that do not add up to more than 40.

MORE INFORMATION
================

You can determine the total number of threads that the information store uses to
communicate with the MTA by adding the following registry values together:

 - Under the following registry key:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersPrivate

    - Send Threads

    - Delivery Threads

    - Gateway In Threads

    - Gateway Out Threads

 - Under the following registry key:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersPublic

    - Send Threads

    - Delivery Threads

Add 1 or 2 to the sum of the preceding values to account for the internal
information store process that flushes the e-mail messages of users that are
being moved.

If this total number of threads exceeds 40 for Exchange Server 5.5, the
information store process logs the event ID 8512 error message in the
Application event log.


Additional query words: tune tuning

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Keywords          : kberrmsg exc55 
Component         : MDB
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : :5.5
Issue type        : kbprb

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