Product:
Cognos Analytics 11.0.6
Microsoft Windows 2012 R2 server

Problem:
When start Cube Designer we get a log on dialog – even do Cognos BI is setup with Single Sign On (SSO) to the Active Directory (AD).

Solution:
This is by design.
This version of Cube Designer does not support SSO.

Only the BI developers should be using the tool, so there is a few persons who should need to enter the windows password.

More Information:
https://www.ibm.com/support/knowledgecenter/en/SSEP7J_10.2.1/com.ibm.swg.ba.cognos.ug_cog_rlp.10.2.1.doc/c_ug_cog_rlp_get_started.html