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 ...

While there are special programs that enable you to block access to specific IP addresses on a computer, the same results are possible by editing the Windows hosts file, present on all Windows ...

Every device connected to a network has an IP address. It is a unique identifier that locates your computer or Mac on the network. Your Mac connects to the internet through a network or router; which ...