For information about why to customize the EDH key size, see Section 7.6, Customizing the Size of Ephemeral Diffie-Hellman Keys.
Open the /opt/novell/nam/idp/conf/tomcat.conf file.
Ensure that the following lines exist:
JAVA_OPTS="${JAVA_OPTS} -Djdk.tls.ephemeralDHKeySize=2048"