Centos 6 with nginx and php using php-fpm.
Exactly like my other server only, that one works.

No matter what I do, I get this: "File not found."
In the headers it shows it's a 404.

I've googled now for hours, followed all the tutorials but still nothing.

#
# The default server
#
server {
listen 80;
server_name _;
client_max_body_size 500G;
#charset koi8-r;

#access_log logs/host.access.log main;

location / {
rewrite ^/dl/(.*)/(.*)/headers/$ /download.php?link=$1&filename=$2&headers=1 last;
rewrite ^/dl/(.*)/(.*)$ /download.php?link=$1&filename=$2 last;
root /usr/share/nginx/html;
index index.html index.htm index.php;
include conf.d/blockips.conf;
}

error_page 404 /404.html;
location = /404.html {
root /usr/share/nginx/html;
}

# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}

# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}

# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
location ~ \.php$ {
fastcgi_split_path_info ^(.+\.php)(.*)$;
fastcgi_pass backend;
root /usr/share/nginx/html;
fastcgi_index index.php;
fastcgi_param SCRIPT_NAME $document_root$fastcgi_script_name;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;

fastcgi_param REQUEST_URI $request_uri;
fastcgi_param DOCUMENT_URI $document_uri;
fastcgi_param DOCUMENT_ROOT $document_root;
fastcgi_param SERVER_PROTOCOL $server_protocol;

fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx/$nginx_version;

fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;

# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param REDIRECT_STATUS 200;
fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
fastcgi_intercept_errors off;
fastcgi_ignore_client_abort off;
expires max;
break;
}

# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
location ~ /\.ht {
deny all;
}

}

upstream backend {
server 127.0.0.1:9000;
}