End user is accessing Toolbox and getting this error:

Try the instructions that I got from clicking on "More Information" https://java.com/en/download/help/jcp_security.html

You need to add https://toolbox.smcusa.com to the Exception Site List

Depending on which Domino/Notes application on the web you are trying to use and how you get there you also might have to add some of the following addresses:

http://toolbox.smcusa.com

https://domap01.smcusa.com

http://domap01.smcusa.com

https://domap02.smcusa.com

http://domap02.smcusa.com

https://domap03.smcusa.com

http://domap03.smcusa.com

https://domap04.smcusa.com

http://domap04.smcusa.com

Reference to add to Java exception list

And then when you reload the site after adding that, you get this prompt (again):
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Select I accept the risk and want to run this application