Need to remove index.php from URI

I'm trying to rewrite URL's from a ISPConfig 3 NGinX installation. It's hosting a Contao installation we just changed the URL scheme

So I need mydom.com/index.php/Startpage.html to become mydom.com/Startpage.html

I've added:

Code:

# Remove index.php$
if ($request_uri ~* "^(.*/)index\.php$") {
        return 301 $1;
    }

location \ {
        try_files $uri $uri/ /index.php?$query_string;
   
        # Remove from everywhere index.php
        if ($request_uri ~* "^(.*/)index\.php(/?)(.*)") {
            return 301 $1$3;
        }
    }

# Remove trailing slash.
if (!-d $request_filename) {
    rewrite ^/(.+)/$ /$1 permanent;
}

# Clean Double Slashes
if ($request_uri ~* "\/\/") {
  rewrite ^/(.*) /$1 permanent;
}

And also add a config File with some Contao specific optimization's:

Code:

client_max_body_size 200M;



# Anpassungen für Contao
    location / {
        try_files $uri $uri/ /index.php?$args;
#                auth_basic "Devs Only";
#                auth_basic_user_file /var/customers/www/clients/client1/web13/web/.htpasswd;
            }

    location ~* \.(tpl|html5|xhtml)$ {
        deny all;
    }

    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }

    location ~* (/scripts|/system/logs|/system/bin|/system/config) {
        deny all;
    }

    location ~* .(gif|jpg|jpeg|png|ico|wmv|3gp|avi|mpg|mpeg|mp4|flv|mp3|mid|js|css|wml|swf)$ {
        #root   /var/www/vhosts/DOMAINNAME/html;
        expires max;
        add_header Pragma public;
        add_header Cache-Control "public, must-revalidate, proxy-revalidate";
    }

# Anpassungen für Contao Ende

# der direkte Aufruf von Dateien wird in Verzeichnissen mit .ht(access), .ht(dumm) o. .ht(however) einfach mal gesperrt
    location ~ /\.ht {
            deny all;
    }

But I can't get it to work