As soon as you are ready to place the firewall into the network, you should put a password on the root account. This is very important as without it, potential intruders could get in, and place their own password on the system (thus removing your ability to manage/modify the firewall). In addition, you can not remotely control the firewall using Putty without a password. To do so, follow these steps:
If you are not logged in, do so.
Exit the lrcfg script by typing [q] then [Enter]
Type: passwd [Enter].
Follow the prompts to change the password.