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Event ID: 3121 Source: MSExchangeMTA

Source
Level
Description
A resource limit has been reached when attempting to open an association. Number of associations configured: <value> [<value><value><value><value>] (14).
Comments
 
As per Microsoft: "Too many associations may be open. Associations are paths that are opened to other systems. Each association is contained within a connection and is used to transfer messages to a system. You may have multiple associations in each connection". See ME899302 and MSEX2K3DB for information on this event.

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