If you want to reset the password from console you have two ways:

first you can establish the connection with DSS using PuTTY, 

second accessing the console directly. 

Here you can find How To article: kb.open-e.com/How-do-I-connect-to-the-console-remotely_97.html .

When you are connected press CTRL + ALT + P.

After that you should see this window:


If you are sure that you want to apply those changes press Enter.

IMPORTANT: Using CTRL + ALT +P will restore all administrator settings to the factory default.