By default, this behavior occurs as soon as SMB is using security signatures. If security signatures are configured, SMB must be processed synchronously by the redirector. The redirector has to wait until the current SMB command is fully processed before it continues with the next one. The redirector waits until it receives the TCP/IP acknowledgement from server.
Workaround 1Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
- Click Start, click Run, type regedit in the Open box, and then click OK.
- Locate and then click the following key in the registry:HKEY_LOCAL_MACHINE\System\Current ControlSet\Services\LanmanServer\Parameters
- Double-click the RequireSecuritySignature value, type 0 in the Value data box, and then click OK.
- Double-click the EnableSecuritySignature value, type 0 in the Value data box, and then click OK.
- Quit Registry Editor.
Workaround 2Note This workaround is not supported on Windows XP-based and Windows Server 2003-based computers.
Toggle the TCP delayed ACK timer (TcpDelAckTicks) to a lower value. When you do so, the server acknowledges items more frequently but at shorter intervals. You can use hotfix that is described in the following Microsoft Knowledge Base article to specify a custom delayed ACK value:
On a Windows XP-based client or on a Microsoft Windows Server 2003-based client, there is a new registry key named TcpAckFrequency that controls TCP ACKs before the delayed ACK timer is reached.
For more information about this problem, click the following article numbers to view the articles in the Microsoft Knowledge Base:
Article ID: 321169 - Last Review: Oct 21, 2008 - Revision: 1