Solution to Liveconnect call for Applet ID * is not allowed in this JVM instance

Check for the version of Java you installed or the Java security settings.

It is recommended you install Java 7 update 60, or an up to date Java 8. After installing the right Java, follow the following steps to set the java secutity.

1. Open the Firefox browser or restart it, if it is already running
2. From the Firefox menu, select Tools, then click the Add-ons option
3. In the Add-ons Manager window, select Plugins
4. Click Java (TM) Platform plugin (Windows) or Java Applet Plug-in (Mac OS X) to select it
5. Check that the option selected is Ask to Activate or Always Activate or on older Firefox versions, click on the Enable button (if the button says Disable, Java is already enabled)

Internet Explorer

1. Click Tools and then Internet Options
2. Select the Security tab, and select the Custom Level button
3. Scroll down to Scripting of Java applets
4. Make sure the Enable radio button is checked
5. Click OK to save your preference

Safari

1. Click on Safari and select Preferences
2. Choose the Security option
3. Select Allow Plug-ins, then click on Manage Website Settings
4. Click on the Java item, select an option (Ask, Allow or Allow Always) from the pulldown listWhen visiting other websites
5. Click Done, then close the Safari Preferences window

Step 2. Ensure you configure your Java Security Settings the right way. 

1. From your Windows start menu, search for Configure Java and open it.
2. Click the Security Tab on the dialog box.
3. Take the Security Drawer to the lowest point (Medium in Java 7, and High in Java 8). Just ensure it’s at the lowest point.
4. Click on Edit Site List Another dialog will open, now click on add in the next box, Now add the following URLs one at a time and click Add after each;

http://portal.nysc.org.ng/ For NYSC online registration

http://www.mynecoexams.com/ for NECO online registration

http://jamb.org.ng/ For JAMB online registration