error CRRRA3018E during the last step of the RRDI setup

Hello,
     I try to install RRDI and I have the following message in catalina.out of RRDI setup:
CRRRA3018E The RIDW data source connection in Cognos failed to connect. Check if the database client is installed correctly or additional configurations are needed

I have this message during the last step.
My environnement is:
OS: Linux 64 bit
RRDI V2.0.5 64 bits
CLM V4.0.5 64 bits
DB2 V10.1 64 bits
Websphere V8.5.5 64 bits

As documentation indicated, I use the client DB2 in 32 bits. I have added the path /opt/ibm/db2/V10.1/lib32/ in LD_LIBRARY_PATH of startup file (/opt/IBM/WebSphere/AppServer/bin/startServer.sh and /opt/IBM/WebSphere/AppServer/profiles/RationalReporting/bin/startServer.sh).

Moreover I have added the path in /etc/ld.so.conf (https://jazz.net/library/article/1048)

I have used the following command to setup db2 database:
db2 update db cfg for DBNAME using LOCKTIMEOUT 240
db2 update db cfg for DBNAME using applheapsz 1024

I have also used the following command to setup db2 client:
db2 CATALOG DATABASE DW AT NODE <node name>
db2 CATALOG DATABASE RIDM AT NODE <node name>
db2 terminate

Now I have anymore idea.

can someone help me ?

Thank you

David