'Unable to open a connection' error when starting virtual machine manager.

Solution Verified - Updated -

Issue

  • Error when starting virtual machine manager:
Unable to open a connection to the Xen hypervisor/daemon.

Verify that:
 - A Xen host kernel was booted
 - The Xen service has been started


details 
Unable to open connection to hypervisor URI 'xen:///':
libvirt.libvirtError Unknown failure
None

Environment

  • Red Hat Enterprise Linux 5
  • Xen kernel

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