I have a Windows 10 computer from a few years ago and a modem/router (ARRIS) connected through a cat 5e cable and everything works well; I get gigabit speed (which I don't need). If I plug the computer via a Cat 6 cable into another port of the modem/router, it doesn't recognize the network. The lights on the back of the port blink every few seconds as if the computer was trying to connect but it doesn't manage to. I tried the other port with another computer and it worked, but the computer was older and as far as I know could have connected through a lower speed. I tried disabling/enbaling adaptors/checking for updates/resetting the machine. I also reset the modem/router. The cables are buried in walls. What can I do?
Is it possible that for some strange reason the modem/router has associated the first port on the machine and now won't accept switching ports?
In the strange case that for some reason the Cat 6 is not wired right, is there a way that I can select a lower speed so that the connection would work as it does on the other computer? I read somewhere that there can be an issue of the computer trying to connect at a faster speed but not managing due improper cable wiring.
Any other thoughts or tests I can do?
