From (http://community.arubanetworks.com/t5/Unified-Wired-Wireless-Access/Airwave-Password-Recovery/td-p/34149)
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If you've lost the password you use to log in as admin to AMP's web interface, you can update it from the command line with this command which stores a hashed version of 'admin' as the password in our database:
From the CLI:
# dbc "update users set password='2cf94b0aea63ebf7bf41c90fe500603e' where username ='admin';"
If you use a name other than admin, you can change your user's password by modifying the where clause above. For example, to change joemontana's password to admin, this would work:
# dbc "update users set password='2cf94b0aea63ebf7bf41c90fe500603e' where username ='joemontana';"