I'm missing something, as far as Im aware I don't have a root username and password. You have to go easy on me, Im a spoonfed windows boy.

I've got the ip address and have put it in WinSCP, I've tried username and password blank, and also username "root" and password blank but Im getting "connection refused" errors. Obviously I dont have the right details, is there a step I've missed out on?

It mentions in the OP that "default root password is not set on N900" - does that mean it's just blank and unused, or is there some sort of generic password, or does it mean I have to set one up somehow?