Rsync

The IP address of the machine you’re connecting to has probably changed. If the previous had a DHCP lease, that wouldn’t migrate with the new router.

Go on your Windows machine and open up a command prompt. Type in “ipconfig” (no quotes) and validate the machines IP address. It should start with 192 or 10 most likely. Maybe 172.

If it’s the same as it used to be, that’s not the issue. But my bet is that it’s changed.

There is no group activity that you think you would find enjoyment in?

If so, why do you want friends? If you had friends, what would you want to do with them if you hate all group activities?