Windows XP client/Java Security "Password Needed-Networking" popup

[kevin]

When users are in IE and go to an internal web page that
hosts our Helpdesk system, a Java security popup is
prompting to User Name and Password. I have also
recreated this security popup when opening up a Jet
Direct card in IE.

The Java popup shows:
Heading=Password Needed-Networking
Firewall: Unknown Site
Realm: ntlm
Scheme:
Username:
Password:

Clicking the X repeatedly in the top right corner will
eventually get rid of the popup.

How do I make it go away for good?

Thanks

My Sun Java Console shows the following:


Java(TM) Plug-in: Version 1.4.2
Using JRE version 1.4.2 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\
Proxy Configuration: Manual Configuration


----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
java.io.IOException: Server returned HTTP response code:
407 for URL:
http://spellchecker.innovate.com/Spellchecker/SpellCheckAp
plet.jar
at
sun.net.www.protocol.http.HttpURLConnection.getInputStream
(Unknown Source)
at
sun.plugin.net.protocol.http.HttpURLConnection.getInputStr
eam(Unknown Source)
at
sun.plugin.net.protocol.http.HttpUtils.followRedirects
(Unknown Source)
at sun.plugin.cache.CachedJarLoader.isUpToDate
(Unknown Source)
at sun.plugin.cache.CachedJarLoader.loadFromCache
(Unknown Source)
at sun.plugin.cache.CachedJarLoader.load(Unknown
Source)
at sun.plugin.cache.JarCache.get(Unknown Source)
at
sun.plugin.net.protocol.jar.CachedJarURLConnection.connect
(Unknown Source)
at
sun.plugin.net.protocol.jar.CachedJarURLConnection.getJarF
ile(Unknown Source)
at sun.misc.URLClassPath$JarLoader.getJarFile
(Unknown Source)
at sun.misc.URLClassPath$JarLoader.<init>(Unknown
Source)
at sun.misc.URLClassPath$3.run(Unknown Source)
at java.security.AccessController.doPrivileged
(Native Method)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getResource(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged
(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at sun.applet.AppletClassLoader.findClass(Unknown
Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown
Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown
Source)
at sun.applet.AppletPanel.createApplet(Unknown
Source)
at sun.plugin.AppletViewer.createApplet(Unknown
Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
load: class SpellCheckApplet.class not found.
java.lang.ClassNotFoundException: SpellCheckApplet.class
at sun.applet.AppletClassLoader.findClass(Unknown
Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown
Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown
Source)
at sun.applet.AppletPanel.createApplet(Unknown
Source)
at sun.plugin.AppletViewer.createApplet(Unknown
Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection
failed.
at sun.applet.AppletClassLoader.getBytes(Unknown
Source)
at sun.applet.AppletClassLoader.access$100(Unknown
Source)
at sun.applet.AppletClassLoader$1.run(Unknown
Source)
at java.security.AccessController.doPrivileged
(Native Method)
... 10 more

The Java popup shows:
Heading=Password Needed-Networking
Firewall: Unknown Site
Realm: ntlm
Scheme:
Username:
Password:

Clicking the X repeatedly in the top right corner will
eventually get rid of the popup.

How do I make it go away for good?

Thanks