Hello Axel,
thank you for your help, It seems to solve the problem because the browser now attempts to open from the correct domain, but I have another problem that the Office Plugin crashed in Firefox and Chrome, Safara is also not working and IE seemingly have no reaction of clicking "Edit online"
And sometimes word alerts "certificate failure" (Zertifikatsfehler) "when loading SSL libraries"
What can I do?
best regards
Th