Playing with Vagrant - Fixing issues with Virtual Box

There is a confirmed bug in Oracle VM VirtualBox v.4.2.14 (and probably others) that stop you from being able to start newly created boxes with a not so nice error

Windows version

Console version:

Progress object failure: RPC_S_SERVER_UNAVAILABLE 0x800706BA

To fix this you need to  go to the directory where you virtual machine is and then create a SHA1 signature of every vmdk and ovf file in there. Something like this:

cd ~/.vagrant.d/boxes/BoxName/virtualbox  

openssl sha1 *.vmdk *.ovf > box.mf

More info at: https://github.com/mitchellh/vagrant/issues/1850
Hope it helps