If a computer is unable to configure a valid Internet Protocol address, it can't connect to a network. If you plug a laptop directly into a modem with an Ethernet cable and receive a "No Valid IP ...

Those of us with separate modems and routers (some Internet connections have the two functions combined into a single device) are likely to focus on the router and ignore the modem. But, like a router ...

If the Windows Network Diagnostics report displays the message The connection between your access point, router, or cable modem and the Internet is broken after you run the Internet Connections ...