Hello to everybody, my name is Simone Saravalli and I'm new to NGINX world.

This is my problem: I set up NGINX as a reverse proxy to a backend server with Apache. On NGINX side I configured basic authentication for / location:

location / {
auth_basic "Restricted";
auth_basic_user_file /etc/nginx/htpasswd;
proxy_pass http://xxx.xxx.xxx.xxx;
proxy_redirect off;
proxy_set_header Authorization "";
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Ssl on;
}

In this way, when a user goes to http://192.168.0.10 (say the ip of the NGINX reverse proxy), he's prompted for username/password and then redirected to http://xxx.xxx.xxx.xxx as expected.

The problem: if on Apache I set another step of authentication (basic auth, LDAP) something goes wrong. From NGINX's logs I see when I sent username/password for Apache. From Apache's logs I cannot see anything. Obviously I got an error because NGINX doesn't know these username/password because they are for Apache.

How can I solve this problem?

Thanks in advance for any reply. Regards.