Can’t connect to the internet with Intel Virtualization Technology turned on in my BIOS?

Troubleshooting Network Connectivity Issues When Enabling Intel Virtualization Technology on ASUS Windows 10 Devices

Introduction

Intel Virtualization Technology (VT-x or VMX) is a popular feature used to enable various virtualization capabilities on compatible Intel processors. While this feature is invaluable for running virtual machines, developers, or certain applications, some users have experienced unintended side effects, such as loss of network connectivity. This article explores the common issues associated with enabling Intel Virtualization Technology in BIOS, specifically on ASUS Windows 10 Pro systems, and provides guidance on how to troubleshoot and resolve these problems.

Understanding the Issue

Users have reported that turning on Intel Virtualization Technology in their BIOS settings causes their computers to lose network connectivity. The problem persists regardless of whether Hyper-V, Microsoft’s native virtualization platform, is installed or not. Notably, disabling the virtualization feature restores network access, indicating a direct correlation between enabling VT-x and network disconnection.

System Context

• Device Manufacturer: ASUS
• Operating System: Windows 10 Pro
• BIOS Version: American Megatrends Inc. 1203 (dated October 27, 2021)
• BIOS Mode: UEFI
• Hardware Architecture: Intel Processor supporting VT-x

Common Causes and Considerations

1. BIOS Settings and Compatibility

   Some ASUS motherboards have specific BIOS configurations that may influence network behavior when virtualization is enabled. While official support documentation may not explicitly mention network issues, certain firmware or BIOS versions might have bugs or compatibility issues.

2. Network Adapter Drivers and Settings

   Virtualization can sometimes interact with network adapter settings, especially if network adapters are configured for virtual functions or are linked to virtual machines.

3. Security Software or Third-party Applications

   Antivirus or firewall applications may interfere with network configurations when virtualization features are toggled.

4. BIOS Firmware Version

   Outdated BIOS firmware may contain bugs affecting hardware interactions, including networking and virtualization.

Troubleshooting Steps

1. Verify BIOS Settings

   • Enter the BIOS setup during system startup (usually by pressing DEL or F2).
   • Locate Intel Virtualization Technology (VT-x/VMX) and enable it.
   • Check for related settings, such as Intel VT-d or other virtualization options, and test their impact.
   • Save changes and reboot.

2. Update BIOS Firmware

   Before updating, ensure you understand the process and back up current settings:

   • Visit ASUS’s official support website for your motherboard model.
   • Download the latest BIOS firmware available