I have activated the maintenance page plugin and it kills my page www.valuedach.de. Every link and page is now redirected on the maintenance page. So I had to switch it off again.
I have no idea how to solve this probleme. There might be an issue on the server, as I have moved my wordpress installation to a new website (www.valueweekend.de to www.valuedach.de). Any idea how to fix that?