Starting ansible-tower vagrant box

console.log

# vagrant init ansible/tower
A `Vagrantfile` has been placed in this directory. You are now
ready to `vagrant up` your first virtual environment! Please read
the comments in the Vagrantfile as well as documentation on
`vagrantup.com` for more information on using Vagrant.

# vagrant up --provider virtualbox
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Box 'ansible/tower' could not be found. Attempting to find and install...
    default: Box Provider: virtualbox
    default: Box Version: >= 0
==> default: Loading metadata for box 'ansible/tower'
    default: URL: https://atlas.hashicorp.com/ansible/tower
==> default: Adding box 'ansible/tower' (v3.0.3) for provider: virtualbox
    default: Downloading: https://atlas.hashicorp.com/ansible/boxes/tower/versions/3.0.3/providers/virtualbox.box
==> default: Successfully added box 'ansible/tower' (v3.0.3) for 'virtualbox'!
==> default: Importing base box 'ansible/tower'...
==> default: Matching MAC address for NAT networking...
==> default: Checking if box 'ansible/tower' is up to date...
==> default: Setting the name of the VM: ansible-tower_default_1478662182181_94133
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
    default: Adapter 2: hostonly
==> default: Forwarding ports...
    default: 22 (guest) => 2222 (host) (adapter 1)
==> default: Running 'pre-boot' VM customizations...
==> default: Booting VM...
==> 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: Remote connection disconnect. Retrying...
    default: 
    default: Vagrant insecure key detected. Vagrant will automatically replace
    default: this with a newly generated keypair for better security.
    default: 
    default: Inserting generated public key within guest...
    default: Removing insecure key from the guest if it's present...
    default: Key inserted! Disconnecting and reconnecting using new SSH key...
==> default: Machine booted and ready!
==> default: Checking for guest additions in VM...
==> default: Setting hostname...
==> default: Configuring and enabling network interfaces...
==> default: Mounting shared folders...
    default: /vagrant => /Users/jlaska/Projects/ansible-tower

# vagrant ssh

  Welcome to Ansible Tower!

  Log into the web interface here:

    https://10.42.0.42/

    Username: admin
    Password: ************

  The documentation for Ansible Tower is available here:

    http://www.ansible.com/tower/

  For help, visit  http://support.ansible.com/
[vagrant@ansible-tower ~]$ cat /etc/redhat-release 
CentOS Linux release 7.2.1511 (Core) 
[vagrant@ansible-tower ~]$ rpm -q ansible-tower
ansible-tower-3.0.3-1.el7.centos.x86_64

Neither above worked for me (there was no 51-tower-welcome.j2 file in /etc/tower). I had to reset admin password using tower-manage command, and was able to use the default ip (https://10.42.0.42) to login.

To reset admin password:
sudo tower-manage changepassword admin

@rsheyd good solution.
but after the login, it jumps to a page to ask me for a licence :(

I tried to run Vagarnat Up Command after installing Virtual Box and Ansible Tower Image. I'm getting following error, Even I checked BIOS to see whether I need to enable any virtualization options. I've two options which are alredy enabled they are : Intel(R) Vitualization Technology and Interl (R) VT-d Feature, But I don't see any VT-x. Is it old one one?

Stderr: VBoxManage: error: VT-x is not available (VERR_VMX_NO_VMX)
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ConsoleWrap, interface IConsole