Reverse TLS proxy

[paucorre]

Hi all,
I very new to NGINX, but thought that it might be the best tool to achieve a
reverse proxy  ( in the DMZ ) for an internal HTTPS server.


Unfortunately it isn't working and I get 502 Bad Gateway message if I check
in the error Log I see :

2014/10/07 17:38:27 [crit] 2606#0: *1 connect() to 172.16.36.155:9999 failed
(13: Permission denied) while connecting to upstream, client: 10.51.44.100,
server: ping0a.cisco.net, request:
"https://172.16.36.155:9999/pingfederate/app/", host:
"ping0a.cisco.net:9999"


with a tcpdump in the HTTPS server that it is in the internal LAN I don't
see any traffic arriving ....

I have a split dns schema in my test, and the FQDN name in the internal
HTTPS server is the same as the on e in the DMZ ( ping0a.cisco,.net ).

This is my configuration :
[root at ping0a nginx]# more nginx.conf

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request"
'
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

upstream backend {
    server 172.16.36.155:9999;
}

    include /etc/nginx/conf.d/*.conf;
}


[root at ping0a conf.d]# more ping0a_ssl.conf
# HTTPS server
#
server {
    listen       9999 default ssl;
    index index.php index.html index.htm;

    server_name ping0a.cisco.net;

    ssl                 on;
    ssl_certificate      /etc/pki/tls/certs/IdP.pem;
    ssl_certificate_key  /etc/pki/tls/private/IdP.key;

    ssl_session_timeout  5m;

    ssl_protocols  SSLv3 TLSv1;
    ssl_ciphers  ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+EXP;
    ssl_prefer_server_ciphers   on;

    location / {
        proxy_store off;
        proxy_pass https://backend;
        proxy_set_header X-Real-IP  $remote_addr;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Host $host;
        proxy_ssl_verify off;
    }
}

from the hosts in the DMZ where NGINX is installed I can reach the inetrnal
HTTPS server 

[root at ping0a conf.d]# wget --no-check-certificate
https://172.16.36.155:9999/pingfederate/app
--2014-10-08 11:20:25--  https://172.16.36.155:9999/pingfederate/app
Connecting to 172.16.36.155:9999... connected.
    WARNING: certificate common name ‘ping0a.cisco.net’ doesn't match
requested host name ‘172.16.36.155’.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: ‘app’

    [ <=>                                   ] 5,576       --.-K/s   in 0s

2014-10-08 11:20:25 (45.8 MB/s) - ‘app’ saved [5576]


What is wrong in my configuration ? 

Thank you,
Paulo

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,253833,253833#msg-253833