I think the problem is that you are storing your images in /srv/www/wp-uploads/blog.linformatronics.nl/2013/01 but your link to the image is https://blog.linformatronics.nl/wp-uploads/2013/01/ccs5licence1.png.
What you need to do is tell wordpress to store the images in /srv/www/blog.linformatronics.nl/wp-uploads/2013/01.
What your trying to do, it seems, is store images in wp-uploads/blog.linformatronics.nl but the folders should be swapped. It’s the website name and then the wp-uploads folder.