io.netty.channel.abstractChannel$AnnotatedSocketException: Network is unreachable: no further information:

i get that warning when trying to join another computer on LAN direct connect and when its on the multiplayer screen and it says "searching for lan games..." it doesnt show the game.

I MADE THIS ONCE AND IT WAS CLOSED SAYING IT WAS A DUPLICATE OF ONE THAT WAS TO DO WITH A SERVER, THIS IS NOT. AND IT DIDN'T HAVE AN ANSWER ANYWAY!
MY OTHER IS MC-175857 AND MC-175858 AND MC-172063 AND THE NOT USEFUL ONE IS MC-120362
Also REALMS-3078 BTW is not a duplicate because it's to do with "REALMS" which is different to "LAN".