According to this post: http://lists.mysql.com/mysql/212112, try decreasing the 
max-connections in my.ini to 400 (or even 360 - that it the most connections 
you will make based on the *-ds.xml file setting).

Also, monitor the thread count on the mysqld.exe process - this will give a 
rough idea of how many connections you have. Or you can use the MySQL 
Administrator to monitor the number of connections. I'm sure there is also a 
query you can run in the mysql command-line client to get this info, but I 
don't know the syntax offhand.

Another thing to consider is the memory usage on the database node.  Are you, 
by any chance, booting that system with the /3GB boot option?

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