can't understand why to are not able to access hub manager as you do not need internet access just the wifi from the hub. do you have an ethernet connection on a device
no need for internet connection to get into hub manager especially when using ethernet. I always when I get a new hub connect with ethernet before I connect it to internet so I can make my personal changes to SSID etc
Had problem with digital voice going straight to voicemail after one ring. Discovered that one of my 4 handsets was not charging so changed batteries and now all seems well. Notice that handbook says to leave handsets off bases regularly for a few hours to help maintain battery life. Hope this helps other users.