Product:
IBM Cognos Planning 10.1.1
Windows 2008 R2 terminal server
Oracle database

Symptom:
When user starts Planning Analyst on the Terminal Server, it crash with a error message before login.

Error message:
epAnalystOopHost has stopped working
A problem caused the program to stop working
correctly, Please close the program.

or

Analyst failed to communicate with the Content Manager database.
This can happen if the IBM Cognos 10 Planning services is not running.
please check that this service is running.

Error was:
Unable to retrieve user information for the user that has logged on.

Background:
Cognos Planning 10.1.1 is integrated with Cognos BI 10.1.1 for CAM security.
Oracle database is used for BI content store and planning store.
It looks like the issue goes away if the Analyst user is also part of the system administrator group in Cognos BI, and not only Planning Rights Administrators.

Solution:
Change the specifications on how you connect to the oracle database to be long advance format instead of short format inside Cognos Configuration on the Cognos BI/Planning server.

Go from (host:port/database_sid) to

(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=host-servername.domain.com)(PORT=1521))(CONNECT_DATA= (SERVER=DEDICATED)(SERVICE_NAME=instancename.domain.com)))

Save and restart the Cognos BI service.
Cognos Planning does not connect to the oracle database in the same way as Cognos BI therefore you must use other methods to connect to the database.