Resolving Network Connectivity Loss on Dell Optiplex 7010 Machines with Cloud One - Endpoint and Workload Security

Symptoms

• Network connection drops suddenly several hours after system boot.
• IP configuration may show correct IP but missing subnet mask, gateway, or DNS.
• Network interface may become disabled or enabled but with no actual connectivity.
• Error logs include connection timeouts and DNS resolution failures.
• Windows event logs show LiveKernelEvent errors with network driver dump files in C:\Windows\LiveKernelReports\NDIS.

Root Cause

The issue is linked to the network adapter's Large Send Offload (LSO) feature on Intel I219-LM Ethernet cards commonly found in Dell Optiplex 7010 machines. LSO can cause network instability and connectivity drops when used alongside Cloud One's security modules.

Resolution

Follow these steps to disable Large Send Offload (LSO) on affected Dell Optiplex 7010 machines to resolve the network connectivity issue. The following information has been formatted but the source is microsoft documentation. 

Step 1: Identify Affected Network Adapters

1. Open Device Manager:
   • Press Windows + X and select Device Manager.
2. Expand Network adapters.
3. Locate the Ethernet adapter, typically named Intel(R) Ethernet Connection I219-LM or similar.

Step 2: Disable Large Send Offload (LSO) Feature

1. Right-click the Ethernet adapter and select Properties.
2. Navigate to the Advanced tab.
3. In the Property list, locate the following entries:
   • Large Send Offload V2 (IPv4)
   • Large Send Offload V2 (IPv6)
4. For each entry:
   • Select it.
   • Change the Value dropdown to Disabled.
5. Click OK to apply changes.

Step 3: Restart the Computer

• Reboot the machine to ensure changes take effect.

Step 4: Verify Network Stability

• Monitor the network connection for several days to confirm the issue is resolved.
• Check that the network interface maintains connectivity without interruption.

Additional Recommendations

• Ensure the Cloud One - Endpoint and Workload Security agent is updated to the latest version.
• If the problem persists, consider testing with different network modules enabled individually to isolate any other potential causes.
• For environments with multiple affected machines, consider deploying a group policy or script to disable LSO on all Dell Optiplex 7010 Ethernet adapters.

How to Deploy LSO Disable via PowerShell Script (Optional)

Summary

Disabling the Large Send Offload (LSO) feature on the Intel Ethernet adapter resolves the network connectivity loss observed on Dell Optiplex 7010 machines running Cloud One - Endpoint and Workload Security. This workaround stabilizes network connections and prevents intermittent disconnections caused by the interaction between LSO and security modules.

If you require further assistance, please contact Microsoft.