I have a LAN with 3 PC: 2 XP sp3 (A - connected by cable & B - wi-fi) 1 Vista 64 sp2 (C - cable), connected to the internet through a modem/router/switch. Connected to the modem there's a USB HD that I use to store files on-line, accessible through samba.
Since three days, suddenly, I'm no more able to copy files from C to A, but I can do it from A to C. I can do it from C to B and form A to B and vice-versa. I've tried rebooting the modem, disabling firewalls, but nothing happens.