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According to the Java website (first note), “Starting with Java 7 Update 51, applications without certificates (i.e. unsigned applications) or missing application names and publisher information are blocked by default. The use of this type of application is potentially unsafe and risky.” This can lead to problems with internal applications that are generally not signed and do not provide a clear solution to run these applications.
Oracle’s proposed answer to this problem is as follows:
“It is strongly recommended not to run this type of application. However, if you understand the risk and still want to run the application, you can add the URL of this application to the list of exceptional sites located in the Security tab of the Java Control Panel. After successfully adding this application URL to this list, you can run it after displaying some security warnings”.
If you encounter a Java applet in your web browser and see a window called Application Blocked by Security Settings, don’t worry. Your security settings have prevented the execution of an application with Java (JRE) that is not secure or has expired. An older version of Java may be running on your computer. This warning message is displayed to protect your computer system from potential vulnerabilities that may exist in older versions of the plugin. By blocking the application, it is not allowed to run it in your web browser.
Workaround Solution
If you cannot install/update the latest version of Java, and you are sure that the unsigned Java applet is secure, you can work around this problem by adding an exceptional site or temporarily reducing the security level of the currently installed Java:
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- Click on the Windows Start menu in the lower left corner of the screen –> Control Panel –> Programs –> Java.
- In the “Java Control Panel” window that appears –> Click on the “Security” tab.
- If there is a Site List Exception section in this window, click on the Edit Site List…….. button. –> Click on the’Add’ button –> Enter the web server location for the Java applet such as’http://www.math.ucsd.edu/’ –> Click on the’OK’ button –> Click on the’OK’ button.
- If there is no Exception Site List section in this window –> Move the security level display from High to Medium –> Click the Apply button –> Click the OK button.
- Close ALL open windows. You must completely exit the web browser, otherwise this workaround will fail.
- Restart the web browser.
- Go to the Java applet.
- If the Security Warning window with the “Do you want to run this application” prompt appears, if there is an option “I accept the risk and I want to run this application”, select it first on ON and then –> Click on the Run button.
- The Java applet should now load correctly. You may need to click on it to start it.
- When you have finished using the Java applet, you should change the “Security Level” from Java to “High” if you have already set it to “Medium”.
Clear cache and cookies
Clear the cache and cookies only on sites that cause problems.
“Empty the hiding place”:
Firefox > Settings > Advanced > Network > Cached Web Content: “Clear Now
“Delete cookies” from pages that cause problems:
Firefox > Settings > Privacy > Cookies: “View cookies”.
It is possible that the cookies.sqlite file that stores cookies may be damaged if cookie deletion does not work.
Rename (or delete) the.sqlite cookies (cookies.sqlite.old) and delete other existing cookie files such as cookies.sqlitejournal in the Firefox profile folder if the cookies.sqlite file has been damaged.
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