Can't connect to modem router C7000

Again, I can't get my C7000 to connect to 192.168.1.1, routerlogin.net or routerlogin.com. This keeps happening on both Netgear modem routers I've owned.. Chrome, Windows 10, connected with ethernet cable, Also can't get Nighthawk App to connect on android device. Suddenlink is my internet provider.