When iManager is used to load user quotas for large number of users, it might take a few minutes to load the quotas. At times the browser might become unresponsive or you might hit the "HTTP STATUS 500" error because of insufficient Java heap memory. To resolve this issue, increase the Java heap memory at /etc/opt/Novell/tomcat6/conf/novell-tomcat6.conf using the following procedure:
Edit novell-tomcat6.conf and add JAVA_OPTS="$JAVA_OPTS -Xms1024m -Xmx2048m after JAVA_OPTS="-Djava.library.path=/opt/novell/eDirectory/lib64:/var/opt/novell/tomcat6/lib:/usr/lib64".
After saving novell-tomcat6.conf, restart Tomcat using rcnovell-tomcat6 restart command.