icedtea6-plugin: Facebook photo uploader applet fails to run: "No valid license key for current dns/ip address specified"

This issue seems distinct from bug 258762 as the symptoms are different and I am running 8.10 rather than 8.04. In my case, the applet loads correctly, and I am able to select photos from my local filesystem to upload, but when I click the "upload" button, I receive the error:

"No valid license key for current dns/ip address specified. If you see this message contact site administrator."

This doesn't look like an error from the plugin; I assume it is from the applet itself in response to an error condition.

This symptom has been reported in the forums and in a Facebook discussion thread as well:

http://ubuntuforums.org/showthread.php?p=6077736
http://www.facebook.com/topic.php?uid=2373072738&topic=21275

The applet in question is:
<EMBED CODEBASE="http://upload.facebook.com/controls/" CODE="com.facebook.facebookphotouploader.FacebookPhotoUploader.class" ARCHIVE="FacebookPhotoUploader.jar" HEIGHT="320" WIDTH="580" >

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 8.10
Package: icedtea6-plugin 6b12-0ubuntu6
ProcEnviron:
 LC_COLLATE=C
 PATH=/home/username/bin:/usr/lib/ccache:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/sbin:/usr/sbin:/usr/games:/usr/lib/surfraw
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
SourcePackage: openjdk-6
Uname: Linux 2.6.27-7-generic x86_64