Knowledge Base

XADM: PerfMon Limited to 53 MTA Instances

Article ID: 143186

Article Last Modified on 10/28/2006

APPLIES TO

This article was previously published under Q143186

SYMPTOMS

Only 53 Microsoft Exchange Message Transfer Agents (MTAs) can be viewed in the Windows NT Performance Monitor (PerfMon).

CAUSE

The MTA service limits the number of MTA PerfMon instances to 53 by default.

MORE INFORMATION

The number of MTA PerfMon instances can be viewed by starting PerfMon, clicking the Edit menu, clicking Add to Chart, clicking MSExchangeMTA Connections in the Object drop down box, and then viewing the Instances list box. The maximum number of instances viewable by default is 53 and this includes other MTAs, MDBs, and gateways.

The number of instances is calculated using the LAN-MTAs registry parameter under: 
   HKEY_LOCAL_MACHINE
      System
         CurrentControlSet
            Services
               MSExchangeMTA
                  Parameters

If the LAN-MTAs parameter is set to a value less than 53, there will be a maximum number of 53 instances viewable.

Microsoft Exchange Servers that are exhibiting many MTA 9406 and 9407 event ID's might need to have this value increased.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 4.0. This problem was corrected in Microsoft Exchange Server 4.0 U.S. Service Pack 2. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Keywords: kbother KB143186


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