Check this out.
As an administrator type user I can not change from custom settings back to normal because I do not have the rights. I made the change from normal to custom no problem. I rebooted into Safe Mode and logged in as the administrator. I got the same error and can't change back. I changed a setting on a service
and now I cannot access the www.
A note: On an off over several months, I received denial messages on other tasks, e.g., accessing files, previously.
How can I fix this?