Troubleshooting Server Issues in Smarter Mail

The symptoms are likely due to server NIC issues, with gigabit-class NICs utilizing the TCP offload engine. Gigabit network adapters often enable the “Checksum Offload” feature by default, which calculates a checksum in the IP and TCP headers of the packet, reducing the time-consuming process.

a) How do I disable the checksum offloading through the Windows device manager?

1. First, open the Windows Control Panel.

2. Then, select Device Manager.

3. After that, open the Network Adapters tree node.

4. Next, select the appropriate network adapter properties.

5. Then, select the Advanced tab.

6. Finally, disable all checksum offload properties.

b) How do I disable the Broadcom TCP checksum offloading?

1. First, open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters.

2. Then, click Edit, point to New, and then click DWORD Value.

3. After that, type Disable Task Offload as the entry name and press Enter.

4. Next, right-click Disable Task Offload and click Modify.

5. Finally, type a value of 1 and click OK in the Value Data box.