First, try to restart the computer.
Second, check every other device, connected to the same subnetwork, and see if the DHCP is set to Automatic. This happens sometimes when two devices get the same IP address. How this happens is simple: let's say you have one device set to manual DHCP, that is, with a fixed IP address. The device is shutdown, when you start an other device set to Automatic DHCP, that gets the same IP address as the one with the manual DHCP. Now, you start the device with manual DHCP which wants to get the same IP as the previously started device. You will get "invalid IP configuration"
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