Deluge is way too slow compared to Transmission , did you removed Deluge with all its dependencies ?
^ A login page should normally be displayed when you access that page, if not just follow the steps here -- GoFlex Home Support
^ Yes, its fine. Pleas go ahead.
^ The GoFlex Home runs on software made by Axentra, you need to ask them why they haven't renewed the certificate. But you may proceed as it works just fine.
^ If its still not working, you can always reflash the firmware -- GoFlex Homeâ„¢ : Factory Reflash
And just forget about the USB storage part, one the NAS portal opens, everything else will work. I don't know why but Seagate has these frequent updates and every once in a while one of the updates leave the WebUI inaccessible.
^ I am not really sure, if its necessary I can do it over TeamViewer.
There is a small hole on one of the sides.