A few days ago Oracle released Java update 7u51. This update contains security updates which breaks the applet which is used to configure the NetScaler via the GUI. When you have installed the update and try to open the GUI you’ll get the following warning as shown in the screenshot below.
To overcome this issue you have 2 options:
- Use an older version of Java (not recommended).
- Use the new feature in this Java version (They saw it coming 🙂 ) Which uses an Execption Site List check it out: https://blogs.oracle.com/java-platform-group/entry/upcoming_exception_site_list_in all you have to do is add the NetScaler address to this list.