Server issue
master.sondages.pro/282267

And on my local ngynx :

[shnoulle@poledra ~]$ cat /etc/nginx/sites.d/limesurvey.local.conf
server {
    listen 80;
    server_name limesurvey.local;
    access_log /mnt/data/shnoulle/nginx/logs/access.log;
    error_log /mnt/data/shnoulle/nginx/logs/error.log;
    root /mnt/data/shnoulle/nginx/www;

    location / {
        index index.html index.htm index.php;
    }
    location /master/ {
        index index.html index.htm index.php;
    try_files $uri $uri/ /index.php?r=$uri&$args;
    if (!-e $request_filename){
        rewrite ^(.*)$ /master/index.php;
    }
    location ~ ^/master/(docs|framework|themes/\w+/views) {
        deny all;
    }
    location ~ ^/master/upload/surveys/.*/fu_[a-z0-9]*$ { 
        return 444;
    }   
    location ~ ^/master/(.*/)?\.+ {
        return 403;
    }
    location ~* /master/upload/.*\.(pl|cgi|py|pyc|pyo|phtml|sh|lua|php|php3|php4|php5|php6|pcgi|pcgi3|pcgi4|pcgi5|pcgi6|icn)$ 
    {
            return 444;
    }
    }

    location ~ \.php$ {
        include /etc/nginx/fastcgi_params;
        fastcgi_pass   unix:/run/php-fpm/www.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_read_timeout 600;
    }

}