我正在使用certbot申请Let's Encrypt证书，
我的服务器是centos 7.2和nginx 1.11.9。
下面是什么意思？
[root@test ~]# certbot certonly --webroot -w /var/www/www.example.com -d example.com -d www.example.com
Failed authorization procedure. example.com (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://example.com/.well-known/acme-ch
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>", www.example.com (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://www.example.com/.well-known/acme-challenge/k
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>"
IMPORTANT NOTES:
- If you lose your account credentials, you can recover through
e-mails sent to [email protected].
- The following errors were reported by the server:
Domain: example.com
Type: unauthorized
Detail: Invalid response from
http://example.com/.well-known/acme-challenge/wGNv57IGJjHQ9wyzzALktpNaPzfnTtN3m7u3QuO4p40:
"<html>
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>"
Domain: www.example.com
Type: unauthorized
Detail: Invalid response from
http://www.example.com/.well-known/acme-challenge/kFJ0CSuKOdgcT2xmciB4GGNCcnUPoIbpQmA9jOII_Bk:
"<html>
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>"
To fix these errors, please make sure that your domain name was
entered correctly and the DNS A record(s) for that domain
contain(s) the right IP address.
- Your account credentials have been saved in your Certbot
configuration directory at /etc/letsencrypt. You should make a
secure backup of this folder now. This configuration directory will
also contain certificates and private keys obtained by Certbot so
making regular backups of this folder is ideal.
我可以访问
example.com和www.example.com，并且在文档中有一条注释：https://certbot.eff.org/#centosrhel7-nginx注意：
要使用webroot插件，必须将服务器配置为提供来自隐藏目录的文件。如果/.well-known由您的Web服务器配置专门处理，则可能需要修改配置以确保/.well-known/acme-challenge中的文件由Web服务器提供。
那是原因吗？
如何修改配置？
最佳答案
这是一个非常普遍的问题，但是幸运的是应该很容易解决。让我们加密必须能够从.well-known目录读取，以验证您的服务器确实托管了您想要证书的域。
首先，请确保您在网站根目录中有一个.well-known目录。设置您的权限，以便从外部可以读取它； 775应该是完美的。
然后，将此片段添加到Nginx中的虚拟主机文件中：
location ~ /.well-known {
allow all;
}
这将允许对我们刚刚创建的.well-known目录的任何请求。现在，尝试再次请求证书，看看它是否有效。