One of two, (or maybe both) things have happened. It could be the ethernet on the router/wifi modem, or the ethernet connections on your devices. In between the main boards and the ethernet plug, are pico fuses, that are supposed to blow if there is a surge to protect the boards and equipment. It's very likely that one or both sides blew. If you have a WiFi modem from Cox, you can either have a tech come out and swap it, or bring it to a Cox Solutions store, and exchange it yourself, (the faster option of course). If you own your OWN router/wifi modem then you will probably need to replace it yourself. If it's a router connected to a modem, you can try Removing the ethernet from the router, connect to computer or device, and REBOOT the modem. (Always restart the modem whenever you change what's connected direct to it). If the device works after the modem comes up, then your router ethernet ports are failed. IF you have a wifi modem from Cox, and replacing doesn't fix the issue, then we are back to the pico fuses on your own devices are blown and the ethernet ports will not work.
Wish I had better news for you. (38 years, computer engineer/Lan Wan specialty with network security and analog/digital communications).
