I finally got it to work. I had set both
WordPress address (URI): https://example.com
Blog address (URI): https://example.com
And then went back and added an .htaccess file that redirected all urls to add https://www., thus creating https://www.example.com as my blog address.
After I did this, it messed everything up for a while, and I kept getting this error. Finally, somebody said something in a post that triggered my memory, and I went in, changed the above settings in Options to reflect the addition of “www.” and now it all works again.
Very Happy.
Just a note, this had nothing to do with Norton, ZoneAlarm, my browser or my operating system, as I had the same problem on Macs, Pcs, Opera, Firefox, IE 6, and Safari. (referenced to help other people with a similar problem.)