//nginx-server proxying roundcube using

    location / {
                    proxy_pass http://10.10.10.14/roundcubemail/;
                    proxy_set_header Host $host;
                    proxy_set_header X-Real-IP $remote_addr;
                    proxy_set_header X-Forwarded-For
                       $proxy_add_x_forwarded_for;
            }