This article is from the Secure Sockets Layer Discussion List FAQ, by Shannon Appel SAppel@consensus.com with numerous contributions by others.
Newer versions of Netscape's browsers enforce the legal export
control requirements of the SSL v3 specification and will not work
with servers that violate the export control provisions of the SSL v3
Some SSL servers do not properly follow the SSL v3 specification's
requirements for the U.S. Government's export control regulations.
Netscape's server products, and most other brands of server products,
conform to the specification, but a few others do not.
We strongly advise you to NOT disable SSL v3 in your browser. If you
do disable SSL v3, you lose the extra security protections of SSL v3
with ALL the https web sites you visit. By keeping SSL v2 and v3
enabled in your browser, you get the best protection each site can
Please ask the failing web site to upgrade to conforming servers.
Web sites whose servers violate the specification have several
options at their disposal, including falling back on the less secure
SSL v2, by disabling the non-conformant SSL v3 in their servers, or
replacing their servers with servers that conform to the SSL v3 spec.