VERR VMX MSR VMXON DISABLED when starting an image from Oracle virtual box

Question

I m getting this error while loading a Puppet image from a Oracle virtual box  How can I fix it   Failed to open a session for the virtual machine learn-puppet-centos-6 4-pe-3 1 0   VT-x is disabled in the BIOS   VERR VMX MSR VMXON DISABLED    Result Code  E FAIL  0x80004005  Component  Console Interface  IConsole  8ab7c520-2442-4b66-8d74-4ff1e195d2b6    In addition  I see that the acellerate-tab in Virtual Box is disabled

User · Answer

When I try to set Base Memory around 4000MB  my pc have 8GB  I get the same error  VT-x is disabled in the BIOS   But when I reduce Base Memory to 2500MB it works and error is solved

User · Answer

I have  Intel Virtualization  set to enabled in my BIOS  and I still get this error   It turns out the problem is that I had Hyper-V enabled in  Windows Features   and apparently VirtualBox and Hyper-V don t play nicely together   I went to Control Panel -  Windows Features and unchecked Hyper-V   After a reboot  Hyper-V was gone  and I was now able to run my 64-bit VMs again in VirtualBox

User · Answer

That error message also appeared into my VM  First of all  I tried to disable the option  Enable VT-x AMD-V   you can find it opening the settings of your VM  Settings- System- Acceleration   there was a warning saying that  Invalid settings detected  you accept the changes and the box was selected again    Then I read this posts and I tried to enable the Virtualiation Techniuqe  used when you want to enable various VM in your computer  by default is set as Disabled because you don t need that property working

User · Answer

Which version VirtualBox do you use  I found the same problem and when use update latest version on my X64 win7 machine VirtualBox-4 3 4-91027-Win But I uninstall it and back to VirtualBox-4 2 18-88781-Win  It works well  try it until Oracle fix it

User · Answer

That s pretty simple problem to fix as you can see in the error message  You don t have to go with the previous version of virtual box  rather try this  go to your BIOS setting     inside the virtualization tab enable the virtualiation techniuqe  restart your PC and you will have your Virtual Box up and running

User · Answer

I upgraded to Windows 10 x64  from Windows 7 x64   had a VirtualBox Windows 10 x64 VM  but got the VT-x error   My BIOS was enabled  settings - everything in this post was addressed  but still got the VT-x error   What fixed it for me was to go to Lenovo and install the latest BIOS for my W550s ThinkPad  Once the upgrade was installed  VirtualBox gave me the x64 options again with no more VT-x errors   If you are running a W550s  the BIOS version I installed was from September 2015   BIOS Update Utility  n11uj05w exe  version 1 10 from the Lenovo website

User · Answer

There is an option in the Virtual Box itself  If you look in the Oracle VM Virtual Box Manager  Select the Virtual Box you want to start  Go to System  the second from above item in the right pane  In System go to the third tab called acceleration  In that tab the first check box is called something like   VT-x AMD-V   I have the Dutch version  so I don t know the exact string  UNCHECK And then start  That worked for me   I also got this problem after an upgrade  And I did not have the problem before  But I fail to see the exact connection between the update and the check unchecking of that option   By the way  I have no idea where the hell that  virtualization tab  should be in my  BIOS   Maybe I was looking in my PC s BIOS not the System page here which is the BIOS of the VM Machine maybe and that is what you meant Veer7  If it was  it was pretty unclear you meant this  Maybe it s because I have OVM in Dutch not English  But there was nothing called BIOS in the Oracle VM Virtual Box Manager I could find

User · Answer

I had the same problem  I enabled vtx in bios and it didn t worked  After a doublecheck in the bios I recogniced that the bios said that you have to poweroff  and realy power off  the computer  After that it worked  Heavy Pitfall

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If you start a 64 bit virtual machine on a 32 bit host machine you will get this error

User · Answer

It happened to me too  and After reading all solutions  I ve deleted the created drive and started all over   The first case  the one that didn t worked  was windows 7 64 bit   After trying the config as Win 7 32 bit that error didn t appeared again   Hope this helps someone

User · Answer

I believe VirtualBox is throwing this error for a number of reasons  Very annoying that it s one error for so many things but  I guess it s the same requirement it s just that the root cause is different   Potential gotchas    You haven t enabled VT-x in VirtualBox and it s required for the VM    To enable  open vbox  click the VM  click Settings     System- Acceleration- VT-x check box   You haven t enabled VT-x in BIOS and it s required     Check your motherboard manual but you basically want to enter your BIOS just after the machine turns on  usually DEL key  F2  F12 etc  and find  Advanced  tag  enter  CPU configuration   then enable  Intel Virtualization Technology    Your processor doesn t support VT-x  eg a Core i3      In this case your BIOS and VirtualBox shouldn t allow you to try and enable VT-x  but if they do  you ll likely get a crash in the VM    Your trying to install or boot a 64 bit guest OS    I think 64 bit OS requires true CPU pass-through which requires VT-x   A VM expert can comment on this point    You are trying to allocate  3GB of RAM to the VM    Similar to the previous point  this requires   a  a 64 bit host system  and  b  true hardware pass-through ie VT-x     So for my little mess around machine that I m resurrecting that has 8GB RAM but only a ye-olde Core i3  I m having success if I install  32 bit version of linux  allocating 2 5GB RAM   Oh  and wherever I say  VT-x  above  that obviously applies equally to AMD s  AMD-V  virtualization tech   I hope that helps

User · Answer

Recently I had this same problem on windows 10 - after installing Hyper-V  amp  other windows features like  Windows Projected File System  Windows Sandbox  Windows Subsystem for Linux  Work Folders Client  And it stopped working for me    Step uninstall Hyper-V -check if ti stared to work for you - no in my case Step uninstall other windows features mentioned above  - I worked for me

User · Answer

Just try adjusting   decrease   your allotted RAM for the virtual machine in Motherboard in settings  The amount of RAM free in your system at that time might be less than the amount you have allotted for the virtual machine  This worked for me

[virtualbox] VERR_VMX_MSR_VMXON_DISABLED when starting an image from Oracle virtual box

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