There are a few potential causes for why your LAN cable may not be connecting to your PlayStation 4. One possibility is that the cable is not properly connected to the PlayStation 4. If you have difficulty connecting to your PlayStation 4, it may be worth checking to see if there are any issues with the Ethernet connection or cable itself. Another possibility is that the PlayStation 4 is not compatible with your LAN cable. If this is the case, you may need to purchase a new LAN cable or upgrade your PlayStation 4’s firmware.