Java.Net.SocketException: Option unsupported by Protocol: Create

[Steve Feldman]

I'm receiving a very strange error. I have an application (applet embedded in a .jsp page) accessible through the Internet. I can access the applet when viewing the application from IE 4.0. However, I cannot access the application from IE 5.0 and 5.5. In the past the application worked in 5.0 and 5.5 browsers, so I am pretty sure it is not a server configuration error.
Is there any way that this could be a result of the caching of the applet?