This article describes how to impose the half-open TCP connections limit in Windows Server 2008 with SP2 and in Windows Vista with SP2. In testing you can see the value is limited to 11.This registry entry only works in Windows Server 2008 with SP2 / Windows Vista with SP2 / Window 7.It is time to retire for me!Full article in How to enable the half-open TCP connections limit in Windows Vista with Service Pack 2 and in Windows Server 2008 with Service Pack 2INTRODUCTIONBy default, the half-open TCP connections limit is disabled in Windows Server 2008 with Service Pack 2 (SP2) and in Windows Vista with Service Pack 2 (SP2).
TCP-Z only show this value.After Vista 16670 and Windows 7 6956, Microsoft strangely set TcpCreateAndConnectTcbRateLimitDepth to 0 in default.In latterly version of TCP-Z, it will show a lock icon to distinguish these difference.Now, Microsoft answer: It's safe! And provide a simple modification method by registry.When you add a registry entry 'EnableConnectionRateLimiting', and set to 1 or 0, it will switch TcpCreateAndConnectTcbRateLimitDepth between 1/0 synchronously.You can see the changes in the graph of TCP-Z.After TcpCreateAndConnectTcbRateLimitDepth change to 1, Windows will calculate the create rate and do the limitation.
So, in tcp-z, this function never be active. In Vista, I can simply modify the value ' TcpCreateAndConnectTcbRateLimitDepth' from 1 to 0 in the kernel memory, and then the Half-open TCP connections limit has been removed immediately!But I am not sure whether this is a safe method. Good news from Microsoft!, Microsoft confirm that:By default, the half-open TCP connections limit is disabled in Windows Server 2008 with Service Pack 2 (SP2) and in Windows Vista with Service Pack 2 (SP2).Thank for this, my doubts about RateLimit long time ago has been solved by Microsoft's answer.Last year, I found a case.
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