For a reason unbeknownst to me, my Xbox has decided to cease any communication with the rest of the network. Nothing in the network settings or arrangement of the connection routing has changed in the time between functional connection and the connection failure. My Xbox connects (or rather connected) to the internet through a splitter plugged into my router (more connections in the house than I have ports in the router). The three other computers in the router function perfectly, the splitter registers in the router settings, and all connections through the splitter, except the Xbox, are completely functional. All lights on the router and splitter show connectivity, except whatever port the Xbox is plugged into.
I have tested three cables, all of which work without a problem when plugged into another device. I have cycled my modem, router, and splitter in the correct order multiple times. This issue has persisted for more than 24 hours with repeated restarting of the console. I am unable to forward the ports for the Xbox since I cannot access its IP, as it is not even registered as being plugged in to the network. I don't think the ports are the issue, as they were not forwarded when the console was functioning.
Attempts to test the connection through the Xbox network settings results in a frustrating "To use a wired Internet connection, make sure an Ethernet cable is connected to both your console and your router or modem." message. As I stated earlier, the cables plugged into it are indeed functional and are properly plugged into the console. Any assistance with my situation would be greatly appreciated.