Thanks for your reply! I spent some hours figuring out what was going on. It appeared to be GZIP compression being a bad guy here. When I disable GZIP it works perfectly and throws in an 403 - Forbidden page.
On the other hand, when GZIP is enabled it throws in these weird symbols instead...
Have you got any idea how I can enable GZIP while having the 403 - Forbidden document to be displayed? Or have you got any idea I can hide the location to this /applications folder in general so the user doesn't have any idea there's a folder behind that url?
Thanks for your continued support !!