For those who have still the same problem: I finally find a solution:
Just import the certificate from the fritzbox into linux (If you installed Nextcloud e.g. on a vServer like i did)
- Copy your CA to “dir /usr/local/share/ca-certificates/”
1.1 Use command: “sudo cp foo.crt /usr/local/share/ca-certificates/foo.crt” - Update the CA store: “sudo update-ca-certificates”
EDIT:
Yeah so you can add the external storage now, but as soon as I want to connect to it, it seems that the FTP-Server of the fritzbox is crashing, because I cant connect for a few seconds from whatever device i try