My game consoles won't connect to the internet

[Uzumaki Goku]

Neither my Switch nor my PS4 will connect to the internet and I presume the Xbone won't either, but I haven't tried it. The weird thing is, everything else works. The computer works and my phone connects, but not the game consoles. It's weird that all of them are affected instead of just one. What should I do?

 

[TheMadTitan]

Probably an IP conflict if you never gave them static IPs. Reset their connections with your router either in their settings, or by unplugging your modem and router for about a minute. Unscrew the coax, too.