Hi KKrystal, most likely Firefox is not set up to work with your security software's web filters. To confirm the source of the issue, could you:

On the error page, click the Advanced button. This should display additional technical details about the source of the problem. In particular, it should show an error code that usually starts with SEC_ERROR. Could you copy/paste that error detail into a reply?

Jumping ahead in case it's helpful, this article covers one of the codes that comes up most often on this forum: How to troubleshoot security error codes on secure websites.

https://www.youtube.com/watch?v=oEMllGHJjq8

Unable to communicate securely with peer: requested domain name does not match the server’s certificate.

HTTP Strict Transport Security: true HTTP Public Key Pinning: true

Certificate chain:

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I think what is happening is that a proxy server (ZScaler) is substituting a message from a different server and that causes the error message.

The page it seems to be trying to show you has content like this:

Restricted Website Ahead!

We have noticed that you are trying to access [URL]. This website has been restricted by your organization's Internet filtering and security policy which is why we have prevented your computer from connecting to it.

For further assistance, please contact your IT support organization.