location /
{
	auth_basic "Authorized users only";
	auth_basic_user_file {$path};
}
```

## 4.install vpn for Openvz/Xen(Centos/Debian)
* for Openvz, before beginning PPTPD install, you should cat follows:

``````nginx
#cat /dev/net/tun (#cat: /dev/net/tun: File descriptor in bad state)
#cat /dev/ppp (#cat: /dev/ppp: No such device or address)
```