Summary
DS-NOC may fail to display the Security String image on the Registration page when the Apache Tomcat Server is installed on a Linux machine.

Problem
If Apache Tomcat Server is started from a console that was not connected to an XWindows session, the DS-NOC might have problems with correctly displaying the security image on the Registration page.

Reason
Java requires a connection to XWindows for operations involving graphics. The XWindows libraries must be installed on the Linux machine.

Workaround

1.Before starting the Apache Tomcat Server, enter:
"export CATALINA_OPTS=-Djava.awt.headless=true"