Last updated: October 19, 2017
If you encounter a Java applet in your web browser, and see a window display that says Application Blocked by Security Settings, don’t fret. Your security settings have blocked an application from running with an insecure or expired jre. It may be due to running an old version of Java on your computer. This alert displays to help protect your computer system from potential vulnerabilities that may exist in older versions of the plug-in. By blocking the application, it is not allowed to run in your web browser.
We recommend always running the latest version of Java on your computer. When Oracle releases a new version of the Java plug-in, web browser applications such as Firefox, Chrome, Internet Explorer, Safari, Opera and Torch, may prevent certain plug-ins from launching if the plug-in version is old. It may also be the configuration of your Java Security Settings are preventing applets from loading if your Java version is old. Please see How can I be certain my Java version is current? for more information.
If you decide that you still want to run a blocked application, run it only if you understand the risk and implication of doing so. You may use the Exception Site List to run any blocked application. To do, launch your computer’s Java Control Panel, and click the Security tab:
Click the Edit Site List button. A new Exception Site List window will display. Within the new Exception Site List window, click the Add button:
Click in the empty field under the Location field. Enter the URL (the URL should start with http:// or https://, for example, http://www.domain.com). The domain name of the embedded applet’s codebase URL may differ from the domain name of the web page you are visiting. If so, add both domain names.
Image credit: Pixabay / tpsdave