Here's mine. Don't know about that try-files thing, this one works for
me. Any nonexistent files get my 404 page.

error_page 404 /40x.html;
location = /40x.html {
root /var/www/nginx-default;
}
location ~ \.(php|html)$ {
fastcgi_pass localhost:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /var/www/nginx-default$fastcgi_script_name;
fastcgi_param DOCUMENT_ROOT /var/www/nginx-default;
fastcgi_intercept_errors on;
include fastcgi_params;
}

You should use absolute paths though...

HTH

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