How to Enable Concurrent Half-Open TCP Connect Attempts Limit in Windows Server 2008 and Vista SP2 or Windows 7

Starting from Windows Server 2008 and Vista SP2 (Service Pack 2), the incomplete simultaneous or concurrent half-open outgoing TCP connections limit is disabled by default. The new behavior allows as many as unlimited half-open TCP connections to be created or established at any time. Users or administrators who want to enforce and enable the concurrent half-open outbound TCP connection attempts limit in Windows Server 2008 SP2, Windows Vista SP2, Windows Server 2008 R2 and Windows 7 must manually configure and set EnableConnectionRateLimiting registry key to impose the half-open TCP connections limit.

Previously 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. When the limit is enabled and turned on in Windows Vista SP2, Windows Server 2008 SP2, Windows Server 2008 R2 or Windows 7 based on guide by KB969710 the limit will be ten connections too.

How to Enable Half-Open TCP Connections Limit in Windows Vista with SP2 or Windows 7

  1. Click Start button.
  2. Type regedit in the Start Search box, and then click regedit.exe in the Programs list.
  3. If you are prompted for an administrator password or for confirmation, type your password, or click Continue.
  4. Locate and then double-click the following registry key:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\
    Tcpip\Parameters\EnableConnectionRateLimiting

    Note: In Windows 7, user has to create a new DWORD (32-bit) Value registry entry under Parameters subkey, and named the new value data as EnableConnectionRateLimiting.

  5. In the Value data box, type 1, and then click OK.
  6. Exit Registry Editor.
  7. Restart the computer (in fact, the change takes effect immediately without the need to reboot).

The registry key works on all 32-bit (x86) and 64-bit (x64) edition of Windows Vista with SP2 and Windows Server 2008 with SP2, and unofficially, Windows 7.

Leave a Reply

You can use these tags: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

Subscribe to comments feature has been disabled. To receive notification of latest comments posted, subscribe to My Digital Life Comments RSS feed or register to receive new comments in daily email digest.

New Articles

Incoming Search Terms for the Article

windows 7 concurrent connections - windows 7 concurrent connection limit - concurrent connections windows 7 - concurrent connections in windows 7 - windows 7 concurrent connection - windows 7 concurrent sessions - half open port - how to open tcp ports in windows 7 - maximum concurrent connections windows 7 - vista concurrent connections - windows 7 change concurrent connections - windows 7 max concurrent connections - half open TCP ports IN VISTA - windows server concurrent tcp connections - tcp port limitation - concurrent limit on windows 7 - enable connection rate limiting - half open ports - Windows XP TCP port limit - open half open tcp ports 64 bit xp - half open port limit - ip sessions in windows 7 - windows 7 half open ports - windows half open port - half open port under windows 7 - SP2 concurrent connection limit removal tool - open tcp ports windows 7 - configure half session xp - how to enable ports in windows 7 - increase max connections on windows 7 - open ports on 64 bits windows 7 - SP2 removes the limit of 10 half open outbound TCP connections. - windows 7 ultimate half open limit - window 7 half open limit - windows seven concurrent connection limitation - "how many concurrent connections windows 7" - max half open ports - allow concurrent connections windows 7 - how to open two concurrent wifi connections - Increase Concurrent connection windows 7 - open half port - tcipip ports limit for windows 7 - windows half open port limit - half open TCP ports - How to Enable Concurrent Sessions in Vista sp2 - how many concurrent sessions will windows 7 allow - Increase the maximum limit of half-open TCP/IP concurrent connections - tcp/ip sessions limit xp - windows 7 port limit - windows 2008 R2 activation TCP -