Issues with Internet connection
In the most common case, if something is wrong with your Network Interface Card,you can encounter a networking issue that says Ethernet doesn’t have a valid IP configuration.

The NIC is connected to your router or modem via the Ethernet cable and when it fails to obtain a valid IP address, the problem appears.

A valid IP address is necessary for a computer allow communication with the router and operate in the web. When a router or NIC becomes faulty or in case of incorrect IP address, an error occurs.