XCON: Event Error 3120: A Resource Limit has Been Reached (155302)


The information in this article applies to:

  • Microsoft Exchange Server 4.0
  • Microsoft Exchange Server 5.0
This article was previously published under Q155302

SYMPTOMS

The Microsoft Exchange Message Transfer Agent (MTA) terminates with an Event ID 9405 and the following sequence of events appears in the Event Log:
Event ID 2037 An internal MTA error occurred. There is a negative connection count for locality 52. [BASE KERNEL 6 117] (10)
Event ID 2197 An MTA database server error was encountered while locking a queue. Called from XAPI. Procedure 131. Database error code: ODXOINIU - Object does not exist. Queue: 00000000. [DB Server TRANSFER 28 84] (14)
Event ID 2191 An MTA database server error was encountered while adding an entry to a queue. Called from XAPI. Procedure 131. Database error code: ODXOINIU - Object does not exist. Queue name: 00000000. Object at fault: 060000EE. [DB Server TRANSFER 28 62] (14)
Event ID 2198 An MTA database server error was encountered while unlocking a queue. Called from XAPI. Procedure 131. Database error code: ODXOINIU - Object does not exist. Queue: 00000000. [DB Server TRANSFER 28 127] (14)
Event ID 3128 An MTA database server error was encountered. [XAPI TRANSFER 28 131] (14)
Event ID 3120 A resource limit has been reached when attempting to open an association. Number of sessions configured: 80. [XAPI MAIN BASE 1 91] (14)
Event ID 9405 An unexpected error has occurred which may cause the MTA to terminate. Error: ExchHeapFree Failure. [BASE INCOMING RPC 193] (16)
Event ID 9405 An unexpected error has occurred which may cause the MTA to terminate. Error: Exception e0020002 occurred at Address 77f3cbcd [BASE INCOMING RPC 193] (16)
Note that in the example above, these events appear in the order in which they occurred; they appear in this order if the Event Viewer is configured to view the oldest events first.

CAUSE

The MTA terminated due to a resource shortage. The MTA is attempting to add local resources for remotely-hosted connectors such as the Internet Mail Connector (IMC) or the MS Mail Connector (MSMI).

WORKAROUND

Change the following registry entry to 0x20 to avoid this resource shortage: 
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
                     \MSExchangeMTA\Parameters\MT gateway clients

The default setting is 0x08 and is adequate under normal conditions. However, when an installation has several gateways and connectors configured, additional resources may be required.
Modification Type:MinorLast Reviewed:4/28/2005
Keywords:kbusage KB155302
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