I have faced this issue after integration of new server in our current vmware production cluster. This leads to incompatibility problem with your current HA cluster as you can perform VMotion with below error message: A simple way to fix this issue is by masking NX/DX bit for the virtual machine. To permanently fix this issue you will require to Enable Interl (R) Virtualization Technology (VT) and Non-Excecute Memory Protection in BIOS. To do this you have: Migrate all running VMs in the concerned Esx server. Put the Esx server in maintenance Mode. Reboot the Esx server. While the server is initializing Press < F9 > to Boot in the Bios and go to "Advanced Option " Menu. 5. Select "Processor Options" 6. Select "No-Execute Memory Protection" and enable it. ...