Nginx reverse proxy settings for Exchange 2010/2013 autodiscover.

gistfile1.nginxconf

server {
        listen       443;
        server_name autodiscover.gwtest.us;

        # Enable SSL
        ssl                     on;
        ssl_certificate         /etc/ssl/nginx/mail.gwtest.us.crt;
        ssl_certificate_key     /etc/ssl/nginx/mail.gwtest.us.open.key;
        ssl_session_timeout     5m;

        # Set global proxy settings
        proxy_read_timeout      360;

        proxy_pass_header       Date;
        proxy_pass_header       Server;
        proxy_pass_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;

        location ~* ^/Autodiscover { proxy_pass https://exch1.test.local; }

        error_log /var/log/nginx/owa-ssl-error.log;
        access_log /var/log/nginx/owa-ssl-access.log;
    }

i'm trying to set up reverse proxy with this config,
but when i try to set up mail.app in mac os - i got next error:
"Trying to log in to the Exchange server "autodiscover.server.com" failed. Make sure the email address and password you entered are correct, then click Continue".

and i have no idea where is problem... nginx error log is clean.

if mail.app tries to connect to exchange without any proxy - everything works fine.