I faced this error on Chrome. You cannot visit “site” right now because the website uses HSTS. The HTTP Strict-Transport-Security response header (HSTS) lets a web site tell browsers that it should only be accessed using HTTPS, instead of using HTTP, therefore, preventing access. I received this error because I had accessed this URL previously with a valid secure SSL over HTTPS. After rebuilding my vCenter appliance (VCSA) It didn’t have a valid certificate, and therefore prevented access to this URL.
Fortunately, the fix is simple, open up a new Chrome browser window or tab and navigate to the address chrome://net-internals/#hsts and type the URL you are trying to access in the field at the bottom, “Delete Domain Security Policies” and press the Delete button, viola! You should now be able to access that URL again.
I hope you found this useful, if you have any questions, please comment below. 🙂