SOLVED: Java Plugin in Firefox on 64-bit Windows Server 2003

Sunday, March 29th, 2009 at 3:37 pm | 13,324 views | trackback url
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The corporate VPN software I use to get onto the work LAN uses a Java-based “viewer” applet in a browser to get to my desktop machine (think “remote desktop”, but using a browser + Java applet), is an HTML page which uses Flash to deliver a Java applet, which then is used to do the “remote desktop” functionality. Yes, you read that right… HTML delivers the Flash which delivers the Java.

But I’ve recently rebuilt one of my Windows machines here at the office to include a 64-bit version of Windows Server 2003, and because of that, it’s been a bit of a struggle to find and reload all 174 applications I was previously using on the previous machine, in 64-bit format, as well as the 64-bit drivers necessary to support the peripherals (network, disk, scanner, printer, etc.). One of those was making sure my browsers were functioning correctly for everything I use it for, including accessing the VPN when I work remotely.

To that end, I installed the 32-bit version of Firefox for Windows, then the 32-bit Java SE Runtime 6u13, but that didn’t let Java applets to function in Firefox at all. about:plugins showed that Java u13 was seen and enabled as a valid plugin but applets would not work in Firefox. I tried using the Java Applets Test page, and it would just show a blank region where the applet should have been.

So I tried downloading the 64-bit Firefox for Windows and the matching 64-bit Java SE Runtime 6u13, but that too failed.

After I installed both versions of Java onto the machine, I decided to try the VPN connection using Internet Explorer, which worked, so I knew Java and Java applets were functioning correctly.

After some poking around, I found that there was one minor tweak that was required to get the Java applets to function in Firefox (either bitness).

While MSIE is loaded, go to the Java Test page and while there, you’ll see a Java applet icon in your Taskbar. Right-click on that, and you’ll see something like the following:

Java Control Panel

In the Java Control Panel, there is an option under (Advanced | Java Plug-in) labeled “Enable the next-generation Java Plug-in (requires browser restart)”. Disable (uncheck) that checkbox to enable Java to function correctly with Mozilla, as shown below:

Java Control Panel - Next-generation Plug-in

Also, verify that Mozilla is enabled under “Default Java for browsers”, as shown below:

Java Control Panel - Default Java for browsers

Click Apply, click Ok, then launch Firefox and try your applet again. You should see something like the following:

Firefox Java 64

That’s it, you’re done! Now Java u13 should work fine in Firefox on 64-bit, without any issues.

Last Modified: Sunday, March 6th, 2016 @ 01:25

One Response to “SOLVED: Java Plugin in Firefox on 64-bit Windows Server 2003”

  1. If it was only that easy…

    Does not work with Fortinet RDP Java client

    Yet Java works fine on Namoroka 3.6.3 x64


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