I have a problem. We have FAS-3040, I can't access it via RS232, there is no any answer from controller, but also I know an IP address, but don't know root password (this controller was offline for few years...).
Root password can be reset only from console; you need to reboot filer and interrupt booting to enter special menu (it prompts you after loading kernel). If there is some other user with sufficient privileges and known password, you can use it to reset root password online.
