Prior to 6.1.2 a login attempt with an invalid username would produce the standard "Log on failed - Invalid User ID or Password" message. In 6.1.2 this changed, and the "Database communication error" message is seen when the username is invalid.
Seems to be CSCso69587
<http://wwwin-metrics.cisco.com/cgi-bin/ddtsdisp.cgi?id=CSCso69587>
To Reset the CCMAdministrator Gui password via CLI
1)utils reset_ui_administrator_password