I always logged in using WinSCP in SCP mode, not SFTP.
root@192.168.1.1
User: root
Pass: whatever you chose during setup
It gives me an error message, but it can be ignored as it doesn't seem to have any effect.
root@192.168.1.1
User: root
Pass: whatever you chose during setup
It gives me an error message, but it can be ignored as it doesn't seem to have any effect.