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Event ID: 9156 Source: MSExchangeMTA

A resource limit has been reached while attempting to open an association. There is no free control blocks available for network type 1. The configured count is 40. [BASE IL MAIN BASE 1 282] (10)
See ME193894, ME230497, ME243632 and ME254818 for information about this event.
This occurred on a NT 4.0 SP6A server running Exchange 5.5 SP3 when it lost connectivity with an X400 connector. It was repeated several times during the outage and was couple with event id 9202.
As per Microsoft: "The MTA leaks control blocks. Under stress or slow connection conditions this issue becomes apparent". See ME229643, ME200259 and ME247419 for more infomation.

This behavior can also occur if too few control blocks are available for the message transfer agent (MTA) to use to transfer messages over multiple X.400 connectors. See ME300445 to fix this problem.

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