Launcher Error 400, Security Alert

Since yesterday I have not been able to launch FFXIV. :( I get a security alert, and then I get a System error 400 - HTTPS System Error

Has anyone had this, or does anyone know how to fix this?

I have uninstalled/reinstalled ffxiv several times and that hasn't worked.

Any help would be appreciated!

Do you have windows Defender enabled or did your anti-virus software update recently?

This sounds similar to what my anti-virus gives me when I attempt to load an infected website.

I've just played for 3 hours and now I'm getting that error from the launcher too...