Redirect Module doesn't redirect from node/{nid} to alias
LEL - it's so stupid, I have to clarify this. The redirect module works without any problem. Everything's just like I wanted it. Maybe it's pointed out anywhere, but I didn't read it. 

When the page is set to maintenance mode, it doesn't work. I have some dummy-users that can bypass the "maintenance-page" and use the site. While the site is in maintenance mode, the node/IDs are accessible. When I turned off maintenance mode, the module was redirecting...