HP system management homepage IE11 "this page can't be displayed" on https://localhost:2381/

[geoperkins]

I have inherited (through a company acquisition) some older HP hardware (HP DL380p Gen8 E5-2620) running mission-critical business applications on Windows Server 2008 R2, Microsoft patches up-to-date. I can't open the HP System Management Homepage on this server because I suspect the version (7.1.2) is trying to negotiate an SSL handshake with the Internet Explorer 11 (IE11) browser and can't talk SHA2. Just a guess. How do I confirm this and where can I find support and instructions for downloading a current version of SMH for this hardware?

 I also will need install instructions for SMH and need to know if installation requires a restart.

The specific error from IE11 https://localhost:2381/ is:

This page can’t be displayed

• Make sure the web address https://localhost:2381 is correct.
• Look for the page with your search engine.
• Refresh the page in a few minutes.