An internal MTA error occurred. An attempt has been made to process too many entity control blocks (ECBs) by a single thread. Number of ECBs processed: . [ ] (14)

Details
Product: Exchange
Event ID: 248
Source: MSExchangeMTA
Version: 6.5.6940.0
Component: Microsoft Exchange Message Transfer Agent
Message: An internal MTA error occurred. An attempt has been made to process too many entity control blocks (ECBs) by a single thread. Number of ECBs processed: <value>. [<value> <value> <value> <value>] (14)
   
Explanation

An Entity Control Block (ECB) is a segment of code that is created for each message transfer agent (MTA) and connector that a given MTA communicates with. The ECBs are created during MTA startup.

By default, the Exchange Server MTA is configured for 25 ECB connections to 25 other Exchange Server computers in a given site. This issue can occur if this server count is exceeded.

   
User Action

Follow the procedures outlined in Microsoft Knowledge Base article 205333. This article describes how a few parameters in the registry can be altered to provide increased resources to the MTA service. The information in this article applies also to Exchange 2000 Server.

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