Hello everyone,
I've been struggling with a GNS3 VM issue for months and would appreciate your insights. Below I'll detail my troubleshooting efforts step-by-step:
Background:
Until recently, my GNS3 VM worked flawlessly on:
Windows 11 Home Edition
Victus by HP Laptop 16-d0xxx
Problem Timeline
Initial Error:
Suddenly started receiving "Virtualized Intel VT-x/EPT is not supported on this platform" without any configuration changes.
Upgrade Attempt:
Upgraded to Windows 11 Pro (current version: 10.0.26100 Build 26100) - no resolution.
Troubleshooting Steps Taken
1. Hyper-V/Virtualization Features Disabled
Turned off all virtualization-related features in:
Windows Features > Hyper-V, Virtual Machine Platform, Windows Hypervisor Platform
Executed PowerShell commands:
powershell
bcdedit /set hypervisorlaunchtype off
Disable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V-All
Disable-WindowsOptionalFeature -Online -FeatureName VirtualMachinePlatform
2. Core Isolation & Memory Integrity
Disabled Memory Integrity in:
Windows Security > Core Isolation
3. Group Policy & Registry Edits
Group Policy (gpedit.msc):
Computer Configuration > Administrative Templates > System > Turn On Virtualization Security = Disabled
Registry Modifications:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Hypervisor\EnableHypervisor = 0
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\LSA\LsaCfgFlags = 0
4. Validation Checks
Hyper-V Status:
powershell
Get-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V
# Output: State = Disabled
System Information:
sysinfo returns:
"Hyper-V Requirements: A hypervisor was detected. Features required for Hyper-V will not be displayed."
5. Device Guard/Credential Guard Attempts
Tried disabling (unsuccessfully):
powershell
Disable-WindowsOptionalFeature -Online -FeatureName Windows-Defender-DefaultGuard
Disable-WindowsOptionalFeature -Online -FeatureName Windows-Defender-ApplicationGuard
Errors:
Feature name [...] is unknown
Device Guard Status Check:
powershell
Get-CimInstance -ClassName Win32_DeviceGuard -Namespace root\Microsoft\Windows\DeviceGuard
# Output shows VirtualizationBasedSecurityStatus = 2 (Enabled?)
Additional Checks
BIOS:
Virtualization (VT-x) remains enabled. No recent BIOS updates.
Cross-Platform Test:
Installed Linux + VMware Workstation 17 Pro (17.6.2). GNS3 VM works here, confirming hardware capability.
System Specs
Host OS: Windows 11 Pro 10.0.26100
Software:
GNS3 2.2.53/2.2.54
VMware Workstation 17 Pro
Hardware: HP Victus Laptop 16-d0xxx
Key Observations
The VM works under VMware but not natively, suggesting a Windows configuration conflict.
VirtualizationBasedSecurityStatus = 2 and Hypervisor detection persist despite disabling features.
Request:
Any insights into why Hyper-V components still appear active?
Could the Device Guard output indicate residual virtualization security?
Are there undocumented dependencies in Windows 11 24H2 (Build 26100)?
Thank you for your time!