I have come across this error a couple times. From the GUI for managing HP switches to logging into the SonicWALL SRA device.
Here is the quick and easy way to fix it.
Open control Panels
Click on the Java icon
Choose the security Tab
Next click on the Edit Site List.. (Your screen should look like this)
Click the Add button
Then enter in https://192.168.1.1 (Put your URL here that is being blocked)
Then click OK.
The site you specified should work without issues.
** Update 09/09/2014 **
If you have Java 64bit installed. Remove this version and install the 32bit version. You weill then be able to make the above changes.