For information about why to customize the EDH key size, see Section 7.6, Customizing the Size of Ephemeral Diffie-Hellman Keys.
Linux:
Open the /opt/novell/nam/adminconsole/conf/tomcat7.conf file.
Ensure that the following lines exist:
JAVA_OPTS="${JAVA_OPTS} -Djdk.tls.ephemeralDHKeySize=2048"
Windows:
Navigate to C:\Program Files (x86)\Novell\Tomcat\bin and then double-click tomcat7w.
Under the Java tab, select the following options in Java Options:
-Djdk.tls.ephemeralDHKeySize=2048"