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). This article describes how to impose the half-open TCP connections limit in Windows Server 2008 with SP2 and in Windows Vista with SP2. The limit is ten connections.

Note: In Windows Server 2008 and in Windows Vista with Service Pack 1 (SP1), the system allows for a maximum of ten half-open TCP connections at any time.