Reverse Proxy with multiple SSL servers

Hi everybody,

I'm stuck in a problem and can get it away...
I'm in a Virtual environment :
1 reverse proxy using nginx (firewall's port 80 and 443 are redirect to him)
1 wordpress server using nginx (192.168.1.10)
1 webmail server using Zimbra (https) (192.168.1.15)
1 z-push server using Z-push (http cause i can't configure 2 reverse proxy in https) (192.168.1.16)
1 Cloud server using Owncloud (http cause i can't configure 3 reverse proxy in https) (192.168.1.17)

if i'm configuring only wordpress and Zimbra it's work like a charm.

But when i try to configure another webserver in SSL it stuck !!

this is my serverblock for each server

server {
listen 80;
server_name wordpress.mydomain.fr;

access_log /var/log/nginx/blog-access.log;
error_log /var/log/nginx/blog-error.log;

gzip on;
gzip_http_version 1.0;
gzip_comp_level 2;
gzip_proxied any;
gzip_min_length 1100;
gzip_buffers 16 8k;
gzip_types text/css text/plain text/xml application/xml application/javascript application/x-javascript text/javascript application/json text/x-json;
# Some version of IE 6 don't handle compression well on some mime-types,
# so just disable for them
gzip_disable "MSIE [1-6]\.";
# Set a vary header so downstream proxies don't send cached gzipped
# content to IE6
gzip_vary on;

location / {
proxy_pass http://192.168.1.10/;
}
}

server {
listen 443;
server_name zimbra.mydomain.fr;
keepalive_timeout 70;

access_log /var/log/nginx/zimbra-access.log;
error_log /var/log/nginx/zimbra-error.log;

ssl on;
ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers AES128-SHA:AES256-SHA:RC4-SHA:DES-CBC3-SHA:RC4-MD5;
ssl_certificate /etc/nginx/ssl/zimbra.crt;
ssl_certificate_key /etc/nginx/ssl/zimbra.key;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;

location / {
proxy_pass https://192.168.1.15;
}
}

but when i try to configure other SSL server it won't work.

i've try this :

server {
listen 443;
server_name zpush.mydomain.fr;
keepalive_timeout 70;

access_log /var/log/nginx/zpush-access.log;
error_log /var/log/nginx/zpush-error.log;

ssl on;
ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers AES128-SHA:AES256-SHA:RC4-SHA:DES-CBC3-SHA:RC4-MD5;
ssl_certificate /etc/nginx/ssl/zpush.crt;
ssl_certificate_key /etc/nginx/ssl/zpush.key;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;

location / {
proxy_pass https://192.168.1.16;
}
}

and try to change also this in each serverblock :

server {
listen 192.168.1.15 443;
server_name zimbra.mydomain.fr;

server {
listen 192.168.1.16 443;
server_name zpush.mydomain.fr;

even for owncloud but i've got a Bad Gateway error 502 does anybody have an idea ?

Thanks in advance.

Dob.