I am having the same DropBox issue.
In the SharePoint page I click the `Click here to connect to dropbox` and then the dropbox page shows up in a different tab. On that tab, in dropbox, I go to `Personal Account` -> `Connected apps` and it shows nothing to actually connect to the Dlink NAS, nor does it in `Linked apps` list with any hint of Dlink.
When I then click `Authorize` on the ShareCenter page it says "The site says" `Connection Error`.
I have looked at the actual http calls in fiddler made by the page, I am hard pressed to see it actually calling into Dropbox directly. It seems to make local IP calls (back to the DNS) which look like this (IP changed to procted, well me)
Host:
192.168.1.80 /cgi-bin/login_mgr.cgi
192.168.1.80 /cgi-bin/remote_backup.cgi
192.168.1.80 /cgi-bin/dropbox.cgi
All commands come back with 200, so why does the call to `dropbox.cgi` so why ultimately does the page display a "connection error"?
This appears to be a programming issue related to this feature.....