@morrow without logs this will be hard to track down. can you ask your administrator to open up a support case for this?
Elfrather Weg 5
The location is 15 min from Düsseldorf Airport.
From the airport there is a shuttle service available to the hotel.
Take the A57 to Düsseldorf. Take the exit Krefeld-Gartenstadt.
Follow the signs Novotel.
Travel to Düsseldorf Hauptbahnhof or Duisburg Hauptbahnhof; then take a taxi to the location, 35 minutes from Düsseldorf Hbf or 25 minutes from Duisburg Hbf.