We're using a valid Verisign certificate for signing an applet. When that applet is loaded on a machine with JRE 1.6.0_u20, then it validates the signature correctly. However, previous versions of the JRE are not able to verify the signature. (
My workaround for now was to install JDK 1.5.0_22 on a Virtual PC image, and use that for signing our applet. Has anyone else had this problem? Any better solutions?