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Last Updated: 18th May 2011 05:02:37 am

By default, Windows can handle a maximum of 5000 open TCP connections. If your loads are higher, you may experience problems such as failed requests for new connections and poor performance. You can improve Windows’ ability to handle the connections by making changes to the registry, as described below.

Warning: Use caution when working in the registry. Changes to the registry can cause serious problems, including inability to reboot your machine. You may wish to back up the registry before continuing. For information about using the registry, including backing up the registry, visit support.microsoft.com and type "registry editor" into the Search box. Instructions for working with the registry editor vary depending on your Windows version. 

1. Start the Registry Editor: From the Windows Start menu, click Run (Windows XP) or type Run and press Enter (Windows 7). From the Run dialog, type regedit and click OK.
   
2. In the Registry Editor, locate HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services. From this location, for IPv4, go to Tcpip; for IPv6, go to Tcpip6.
3. Select the registry subkey Parameters, and check the right panel for the registry entries MaxUserPort and TcpTimedWaitDelay.
4. If these entries do not exist, create them: Right-click on Parameters, and from the shortcut menu select New and then select DWORD (32-bit) Value. On the right side of the Registry Editor, you'll see that a new registry entry, New Value #1, is automatically created. Change the names of the new entries as given in step 3.
5. To edit the values of these entries, select the entry and press Enter, or right-click on the entry and select Modify. The Edit DWORD Value dialog opens.
   
6. Change the Value setting for MaxUserPort to 65534, and the Value setting for TcpTimedWaitDelay to 30.