On Sun, Nov 06, 2011 at 10:24:01AM +0100, Matthias Bolte wrote: > > * Installed VirtualBox > > Which version? v4.1.4 r74291 (the current version when I downloaded it 2 days ago) > vbox:///session is the correct URI. OK, that's good to know. > I don't have an OSX at hand for testing, but you can try > > LIBVIRT_LOG_FILTERS=1:vbox virsh -c vbox:///session > > and post the output here. This might give a hint about what's wrong. Brians-MacBook-Air:~ $ LIBVIRT_LOG_FILTERS=1:vbox virsh -c vbox:///session 18:11:05.910: -1: info : libvirt version: 0.9.6 18:11:05.910: -1: debug : tryLoadOne:163 : Found VBoxXPCOMC.dylib in '/Applications/VirtualBox.app/Contents/MacOS' 18:11:05.910: -1: debug : vboxRegister:94 : VBoxCGlueInit found API version: 4.1.4 (4001004) 18:11:05.910: -1: debug : vboxRegister:126 : Unsupport VirtualBox API version error: internal error unable to initialize VirtualBox driver API error: failed to connect to the hypervisor Looks like libvirt doesn't grok this version of VirtualBox. The version of libvirt which Homebrew built was: homepage 'http://www.libvirt.org' url 'ftp://libvirt.org/libvirt/libvirt-0.9.6.tar.gz' sha256 'ce29b1cd3067b224aa834fec2a93d7613c0e72bc035760ad536a2142430bc02b' This seems to be latest stable version - should I try 0.9.7rc2? Aha: 7 days ago... http://libvirt.org/git/?p=libvirt.git;a=commit;h=73ce5050e0dcf897a975fd077d249f42e0549c64 Regards, Brian.