I am learning from http://msdn.microsoft.com/en-us/library/ms143432.aspx, my question is what is the differences between "Connections per client" and "user connection"?
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User connections here is the maximum number of connections that can be made to the server. Connections per client, which I don't believe is configurable, is how many connections an individual client can make.
Here's where there's a difference: a server is configured to allow 200 connections (I'm picking an arbitrary number). The connections per client is set to 10. If I have 198 connections already and a particular client has 5 connections, it can add two more. The limit is the user connections maximum of 200. On the other hand, if I have 12 connections already, 2 from a particular client, that client can add 8 more, bringing its total to 10. It can't add an 11th, because the maximum connections per client is limited to 10.