1、新建站点
创建一个默认站点,输入 default.com
2、修改默认站点
将默认的站点改为default.com
3、给默认站点设置证书
给IP配置上一张带错误域名的证书，我们这里利用了CLOUDFLARE来作为错误证书颁发源，利用CF 接入域名，可以颁发15年的仅CF CDN网络体系承认的证书的功能。
公共证书（PEM格式）

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

密钥（KEY）

-----BEGIN PRIVATE KEY-----
MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgK0HE3hTJQDg6p/fj
nS92eSuRKZEZ5F4grT6tWFKNYVmhRANCAAQIP4WfZQx4/3/tIw0QDdt05DRKiIuO
pghp8GVQ94JcS5fmtZqX1yx0hBU4qZ0skIJr5D2M0BmhCBQ9Kulv2YDL
-----END PRIVATE KEY-----

4、修改站点配置
修改默认站点的配置文件，在server_name default.com;的下一行新增一个返回代码：

return 444;

无论是通过http://IP访问，还是通过https://IP访问，都将返回无法访问的页面.