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Is there any restriction of number of new incoming/outgoing TCP connections/seconds in Windows? If so, are there any differences between Windows versions?

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migrated from stackoverflow.com Jun 5 '11 at 13:34

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Thx. And what about other Windows versions? And is this 'long time' defined as an exact value? –  user83596 Jun 5 '11 at 14:37
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Sorta. In WinXP SP2 and later you are limited as to the number of pending outgoing connection attempts. There is no limit on the number of connections in a certain time period; but if those connections take a 'long time' to connect then you will be limited in how fast you can establish them.

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technet.microsoft.com/en-us/magazine/2007.12.network.aspx mentions TcpNumConnections in a registry location but I couldn't make this work on win 7 at least ? Anyone, a way to increase the concurrent connections limit (or at least number of newly opened sockets per second) ? –  Ghita Dec 2 '11 at 17:33
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