| Event Id | 248 |
| Source | MSExchangeMTA |
| Description | 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) |
| Event Information | According to Microsoft: CAUSE: 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. WORKAROUND: To work around this issue, run Performance Optimizer and change the Number of users setting to the number of users that the connector services, rather than the number of users on the local server. Also set the server to be a Multiserver and Connector server. |
| Reference Links | XCON: Exchange Server Message Transfer Agent in Large Site May Run Out of Entity Control Blocks |
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