Magento – Magento2 with nginix + ssl + varnish admin redirect loop issue

everything working fine, but when I enable secure admin (ssl) it gives redirect loop issue. I am not able to use admin pannel also cross origin issue for front ens static content.

I am using ssl over nginx + varnish.

I tried so many things (even may stackexchange answers) but no luck. can someone help me to tackle this issue.

Nginx configuration (magento2 nginx sample config included).

upstream fastcgi_backend {
  server   unix:/run/php/php7.0-fpm.sock;
}
  server {
    server_name mydomain.com www.mydomain.com 1xx.xx.xx.xxx; #private Ip included
    listen 8080;
    set $MAGE_ROOT /var/www/html/mysiteconf;
    set $MAGE_MODE developer; # or production

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;
  #mujassam
        #fastcgi_param HTTPS on;
    include /var/www/html/mydomain/nginx.conf.sample;
  }
server {

      # listen 443 ssl;

      #added by mujassam
      listen 443 ssl http2; #m ## listen for ipv4; this line is default and
      implied listen [::]:443 ssl http2;
      server_name www.mydomain.com;

      ssl_certificate /etc/ssl/certs/www_mydomain_com.crt;
      ssl_certificate_key /etc/ssl/private/www_mydomain_com.key;
      ssl_protocols              TLSv1 TLSv1.1 TLSv1.2;
      #mujassam
       #  fastcgi_param   HTTPS               on;
       # fastcgi_param   HTTP_SCHEME         https;
       ssl_prefer_server_ciphers on;
      ###
      ssl_ciphers               'AES128+EECDH:AES128+EDH:!aNULL';
      ssl_session_cache    shared:SSL:10m;
      ssl_session_timeout 24h;
      keepalive_timeout 300s;
location / {
    proxy_pass http://127.0.0.1:80;
    proxy_set_header Host $http_host;
    proxy_set_header X-Forwarded-Host $http_host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Ssl-Offloaded "1";
    proxy_set_header      X-Forwarded-Proto https;
    proxy_set_header      X-Forwarded-Port 443;
    #mujassam added
    proxy_set_header X-Forwarded-Ssl on;
    #proxy_hide_header X-Varnish;
    #proxy_hide_header Via;
    proxy_set_header X-Forwarded-Proto $scheme;
 }
}

Hope Some body can help.