Enabling TCP Chimney Offload for a Physical Network Adapter

Applies To: Windows Server 2008 R2

Network adapters that support TCP Chimney Offload must have the feature enabled on the Advanced tab of the network adapter’s properties in Device Manager. Most network adapters have TCP Chimney Offload enabled by default; however, some manufacturers may have it disabled by default. In addition, some manufacturers may use different terminology to refer to the TCP Chimney Offload feature. Check your network adapter’s documentation or consult the manufacturer for details about TCP Chimney Offload capabilities and what settings correspond to this capability.


TCP Checksum Offload, which is available on many network adapters, is not the same as TCP Chimney Offload.

To enable TCP Chimney Offload on a physical network adapter

  1. Open Device Manager (click Start, point to Control Panel, and then click Device Manager).

  2. Expand Network adapters, right-click the network adapter you want to work with, and then click Properties.

  3. On the Advanced tab in the network adapter properties, locate the setting for TCP Chimney Offload or TCP Connection Offload and make sure it is enabled. You may need to do this for both IPv4 and IPv6.