Failed to open a session, The VM session was closed before any attempt to power it on

Calasparro · Post by **Calasparro** » 11. Apr 2020, 16:33

Just get this error on some VMs I try, but I know that these VMs work. Im on Windows 10, and have tried everything seen on Forums to fix this error, but keep getting it.
- Virtualization enabled
- Hyper-V deactivated/activated
- Different configs for the VM
- Different versions of VirtualBox
- Logs don't say anything relevant
- On lower VB versions, program just get stuck when try to init VM, have to close it from Task Manager
Any ideas? It's important for me to solve this, it's for a University subject.

Post by **scottgus1** » 11. Apr 2020, 19:05

This definitely won't work:

Calasparro wrote:Hyper-V.....activated

Calasparro wrote:Logs don't say anything relevant

The forum gurus should judge this. In fact, googling:

"The VM session was closed before any attempt to power it on" site:forums.virtualbox.org

shows that something very relevant could be in the log.

Please zip and post the guest's vbox.log, using the forum's Upload Attachment tab.

Failed to open a session, The VM session was closed before any attempt to power it on

Failed to open a session, The VM session was closed before any attempt to power it on

Re: Failed to open a session, The VM session was closed before any attempt to power it on