nginx front-end to sharepoint

[nginx at d-cohen.com]

Greetings,

I am attempting to replace squid 3.0 with nginx as a reverse proxy to a 
sharepoint server with SSL and user-authentication.  The problem I am 
having is nginx does not appear to pass the credentials to the real 
server w/o modifying them (after several failed attempts, once simply 
gets access denied).  I am able to accomplish this in squid with this 
option: login=PASS

I'm wondering if anybody has any insight/experience into this issue.  I 
have included the relevant portions of my nginx.conf and my old 
squid.conf.  Any help would be greatly appreciated.

Thank you.

nginx.conf:

http {
     server {
         listen       443;
         server_name  192.168.0.10;

         ssl                  on;
         ssl_certificate      /conf/nginx/cert.pem;
         ssl_certificate_key  /conf/nginx/key.pem;

         location / {
             proxy_pass https://192.168.0.1/;
         }
     }
}


squid.conf:

https_port 443 cert=/conf/squid/cert.pem key=/conf/squid/key.pem \
            cafile=/conf/squid/ca.pem vhost
cache_peer 192.168.0.1 parent 443 0 login=PASS no-query ssl proxy-only \
            originserver sslflags=DONT_VERIFY_PEER,DONT_VERIFY_DOMAIN