Vagrant Boot Error

gistfile1.txt

Timed out while waiting for the machine to boot. 
This means that Vagrant was unable to communicate with 
the guest machine within the configured ("config.vm.boot_timeout" value) 
time period. This can mean a number of things.

If you're using a custom box, make sure that networking is properly 
working and you're able to connect to the machine. It is a common 
problem that networking isn't setup properly in these boxes. Verify 
that authentication configurations are also setup properly, as well.

If the box appears to be booting properly, you may want to increase 
the timeout ("config.vm.boot_timeout") value.