I'm using a joyent machine here, for some reason my vagrant box got b0rk3d :-/
glad I had a backup plan
I don't know why but upon trying vagrant up I got : ==> default: Waiting for machine to boot. This may take a few minutes... default: SSH address: 127.0.0.1:2222 default: SSH username: vagrant default: SSH auth method: private key default: Warning: Connection timeout. Retrying...
and it keeps retrying...
@pedrocarrico happens to me also, try to vagrant ssh anyway
most of the time the vm boots fine but it's vagrant that's confused about it
if it doesnt work try to open virtualbox before doing vagrant up, to check for errors
sometimes it fails and I have to vagrant halt and vagrant up again