Router replaced
The update supplied by Draytek didn’t solve the problems: After 6 minutes or so after login on the admin GUI, connection is lost. So I had to replace the Draytek with the Fritzbox supplied by the ISP, in order to ship the Draytek to the supplier to have it checked and fixed; there is no alternative as to work with equipment that does not fit my requirements. No real problem as long as it works – and the situation is expected to be temporary.
What goes on behind the doors of the (private) data center