Browser gives Error.... Duke $$$$$$

hi,
I have an applet-servlet comm. I have everything setup in IIS(internet information services).
I have the Tom-cat running on my another computer with all the classes and jar files...
I am trying to run that program in my computer.
I am using IE6.
I see the applet loaded on the browser but when i do some search in my program i get this error in my Java Console...
ALso i ran that same program from my 3rd computer and it works fine...
I checked all the internet properties and everything seems to be same...
Any help will be greatly appreciated....
Java Console Error.....
==================================================
Connecting...
Getting input stream
Before the inputFromServlet
java.io.IOException: Connection failure with 407
Exception occurred during event dispatching:
java.lang.NullPointerException
     at viewallinfoappletservlet.ViewAllInfoApplet.displayFirstnameLastname(ViewAllInfoApplet.java:534)
     at viewallinfoappletservlet.ViewAllInfoApplet.SearchButton_actionPerformed(ViewAllInfoApplet.java:305)
     at viewallinfoappletservlet.ViewAllInfoApplet.lastnameTextfield_actionPerformed(ViewAllInfoApplet.java:1123)
     at viewallinfoappletservlet.ViewAllInfoApplet$12.actionPerformed(ViewAllInfoApplet.java:263)
     at javax.swing.JTextField.fireActionPerformed(Unknown Source)
     at javax.swing.JTextField.postActionEvent(Unknown Source)
     at javax.swing.JTextField$NotifyAction.actionPerformed(Unknown Source)
     at javax.swing.SwingUtilities.notifyAction(Unknown Source)
     at javax.swing.JComponent.processKeyBinding(Unknown Source)
     at javax.swing.JComponent.processKeyBindings(Unknown Source)
     at javax.swing.JComponent.processKeyEvent(Unknown Source)
     at java.awt.Component.processEvent(Unknown Source)
     at java.awt.Container.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.LightweightDispatcher.processKeyEvent(Unknown Source)
     at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
======================================================

IIS is irrelevant, that's for using Microsoft's server facilities, not tomcat.
Try putting the URL that your applet is trying to connect to into the brower address window directly. That should give you more details.
Likely the URL is wrong or your tomcat is misconfigured. The two relevant configuration files are server.xml (in tomcat/conf) and WEB-INF/web.xml in your webapp directory.

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