vagrant修改默认用户错误问题

vagrant安装好后默认使用vagrant账号登陆，目前修改了vagrant用户为www，开启sshd登陆.其中修改配置：

Vagrant.configure(2) do |config|
  ... ...
  config.ssh.username = "www"
  config.ssh.password = "www"
  config.ssh.host = '192.168.200.100'
  config.ssh.port = "22"
end

使用vagrant up启动机器后报错：

==> default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address: 192.168.200.100:22
    default: SSH username: www
    default: SSH auth method: password
    default: Warning: Connection timeout. Retrying...
    default: Warning: Connection refused. Retrying...
    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: The guest additions on this VM do not match the installed version of

机器启动成功，但smb目录没有挂载到虚拟机中，另外每次vagrant ssh进入机器都需要输入密码。估计是配置问题，求拜各路大神帮忙！！！