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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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.