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Java Plug-in troubleshooting


Installation Difficulties

  1. To confirm that the Java Plug-in is installed visit the Sun site at
  2. Click on the "Download Now" link.
  3. You should receive a confirmation page that displays the coffee cup logo and a confirmation that you have the current version of Java installed.

If you don’t get confirmation the Plug-in was not successfully installed or network problems prevented the confirmation applet from loading.

To resolve these problems first visit the trouble shooting page at and confirm that your computer meets the stated minimum requirements.

If your computer does meet the minimum requirements and you have followed the installation instructions as laid out in the troubleshooting guide, and you are still not receiving the confirmation screen then the problem may be network related.

Network Related Difficulties

Many companies use Microsoft’s ISA Server to provide access to the internet. This server has a user authentication scheme that is incompatible with the current version of the Java Plug-in. To confirm that this is the cause of the problem, follow these steps:

  1. Go to and click on the "Download Now" link.
  2. Double click on the coffee-cup logo in the system tray of your computer (in the lower right corner). This will bring up the Java console.
  3. In the console window scroll down past the list of menu options (enclosed between the dashed lines).
  4. Look in the first few following lines after the menu for this content: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 407 Proxy Authentication Required or  The ISA Server requires authorization to fulfill the request. Access to the Web Proxy service is denied.
  5. If you see the content described above then your computer is accessing the internet through a proxy (the ISA Server) that only supports NTLM authentication, which is not supported by Java version 1.4.1. In this case, you are advised to upgrade your Java installation to version 1.4.2.
  6. To install the Plug-in, visit and download the 1.4.2 JRE (this includes the Java Plug-in)
  7. This solution will immediately allow downloads of specification documents.

Support for electronic submission of tender responses over proxies supporting only NTLM authentication will be possible by mid-June.


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