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Event ID: 41 Source: MSExchangeMTA

Source
Level
Description
There are too many concurrently connected entities. There are no free entity control blocks (ECBs) available. There are currently <value> ECBs configured. [<value><value>value><value>] (14).
Comments
 
As per Microsoft: "An Entity Control Block 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.". See ME205533 to solve this problem.

See MSEX2KDB for additional information about this event.

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