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KB1108 - Problems with Java (an applet will not load or run)
Posted by John Love, Last modified by John Love on 17 July 2017 12:51 PM

If you get this error when trying to runa Java applet:

"Your security settings have blocked a self-signed application from running."

...this means that your version of Java is not permitting the applet to run for security reasons. You will encounter this error in all web browsers. This is a Java system security issue, related to teh version of Java which is installed on your computer.

Systems/Services Affected:

This error message has been observed in one plugin used in VCC's Moodle service: the "Insert Equation" feature (aka DragMath plugin) in Moodle's TinyMCE editor.

The Cause:

For security reasons, Java version 7 (Update 60) will not accept applets that are self-signed. In an ideal world, you should not run Java applets which are self-signed (i.e. where the encryption certificate is not signed by a trusted authority).

"Applications of this type present the highest level of risk because the publisher is not identified, and the application may be granted access to personal data on your computer."

A Work-around:

If you feel confident in the trustworthyness of the publisher (e.g. the creator/distributor of the Java applet), then you can add an exception to tell Java not to worry about this publisher, and allow the applet to run on your system.
(Note: This setting change is made in your Java software, NOT in your web browsers.)

Steps to Add URLs to the Exception Site list

  • Go to the Java Control Panel (On Windows, click "Start" and then "Configure Java")
  • Click on the Security tab
  • Click on the Edit Site List button
  • Click Add in the Exception Site List window

    Add url to Exception Site list
  • Click in the empty field under the Location field to enter the URL

    (URL should begin with http:// or https://)
  • Click OK to save the URL that you entered
  • Click Continue on the Security Warning dialog
  • Reload your browser page and you should see the applet begin to load.


Full instructions here:


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