Vagrant – Authentication failure

Depending on the vagrant version and how you build/package boxes, you may know the Authentication failure after command “$ vagrant up“. Here now two simple tips, how to prevent or fix it.

Prevention

If you build on an existing box you should not allow Vagrant to automatically insert a new key pair.

Workaround

If the problem already exists…

On command “$ vagrant halt” Vagrant will automatically insert a new keypair.