Hi,
To access the CDA GUI try using the supported browsers:
Linux
Firefox versions 9 and 10
Win 7
Microsoft Internet Explorer versions 8, 9 (in compatibility mode), 10, Firefox versions 9, 11, and 26, Google Chrome version 31
Mac OSX
Safari version 5.1.5
Also you can try resetting the user password by running the command:
"application reset-passwd cda (username)"
Regards,
Kush