There is a potential problem with older versions of the Netscape Navigator and Communicator browsers...
The Problem
Web browsers use "digital certificates" for secure connections (such as
online ordering, online banking, some web-based mail, etc.). The
certificates that came with older versions of the Netscape browsers were
set to expire on December 31st of 1999.
Since that time has come and gone, those certificates have expired. If you are using one of the older browsers, you may experience certain problems. Most commonly, a warning window will pop up warning of an expired certificate. However, other problems can result, such as needing to end task/force quit on Netscape when going to a secure site.
Netscape has announced that secure transactions should still take place once you close the message.
Netscape has posted an announcement for this issue at http://home.netscape.com/cms/certinfo.html
Versions Involved
Any version prior to 4.06 (released August of 1998) will have the
certificate problem.
If you are using Windows, you can find out the version you are using by clicking on Help at the top of the Netscape window and selecting About Communicator at the bottom of the list.
If you are using Macintosh, you can find out the version you are using by launching Netscape, clicking on the Apple icon, and selecting About Communicator. Again, if it says About Navigator, it is an older version that will have the certificate problem.
Solution
As mentioned above, your transactions should still be secure. So unless
you are one of exceptions where the program freezes, you can continue to
use the version you have and just close the warning window.
You can avoid the certificate warning altogether by upgrading to a version of Netscape Communicator that has the new certificate information.
There are instructions for downloading an updated version at http://www.azstarnet.com/service/getnet/.
You can also obtain the later versions directly from Netscape at http://home.netscape.com/download/