Step 1: Select Tools → Internet Options in IE, switch to the Advanced tab, and check "Use SSL 2.0" and "Use SSL 3.0". Switch to the Security tab, click the Custom Level button, and make sure that the Show Mixed Content item is Enabled or Prompt.

Step 2: Run the "services.msc" command to open the service management window, find a service named "HTTPSLL", and make sure it is set to "Automatic" or "Manual".

Step 3: Use firewall software or third-party tools to check whether 443 in the open port of this machine is closed. HTTPS pages need to access each other through this port. If port 443 is closed, please set the port to open or contact the LAN administrator.

So in addition to the firewall, it depends on whether your settings in the first and second steps are the same as above.