Or, the ID 10T error...In my work if we can't explain the fix we just call it FM!
I've had the same issue with my laptop for when I want to visit the site while I'm out of town, and the only way to visit the site is using MS Edge browser. How can you log out when you haven't even logged in?From the Help page try logging out. Hopefully that clears the stuck cookie.
As far as the firewall error goes (different issue) it is detecting some kind of bot trying to access the site from your computer. If it does not go away after a few minutes let me know again with a copy of the error message so I can contact the Firewall company for them to diagnose.
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