Disabling LSO on Windows Server 2008 and higher

This is easily done using a NETSH command:

 netsh interface tcp set global chimney=disabled

Disabling LSO on the Ethernet adapter

This works in all versions of versions of Windows Server since it's done at the driver level. Go to where the network adapters are located in the Control Panel. For Windows Server 2003, this will be under Network Connections. For Windows Server 2008, this will be under Network and Sharing Center –> Change Adapter Settings.

Now right-click on the network adapter and choose Properties from the pop-up menu. At the top of this windows will be a "Connect using" text field with the vendor and model of the network adapter. For my example, I'm using an Intel 52575 Gigabit adapter. Just below this text field, click on the Configure button.

Now click on the Advanced tab, which shows the configurable properties for the adapter. Find the entry for Large Send Offload. This is how it's labeled on Intel adapters, but will vary (sometimes wildly) for adapters from other other vendors. If it's modern adapter like this one, there will be a setting for both IPv4 and IPv6. For older adapters, there will only be a setting for IPv4. Change the value for Large Send Offload from "Enabled" (or "On") to "Disabled" (or "Off") and click on OK.