For example, we will take one scenario.
Internet explorer 11 is not supported with Hyperion 11.1.2.3 (Yes, it will support 11.1.2.3.500, 700+ etc with enterprise mode). That case if you open FDM web URL, you will get web application open in below format which is not accessible correctly.
Solution is simple, just go add this URL in IE 11 compatibility settings. Then you will FDM page, will looks good now.
Another scenario:
Internet explorer may not work with Hyperion 11.1.2.3.500 URLs, you can make them working by downloading IE version.
Open IE 11, then Click on F12, then go to Emulation, then select IE version 9 in the drop down settings. Now you URL will get loading page and workspace open.
Otherwise you can uninstall IE version 11, automatically IE previous version come up. So, you can go IE 9 in the same way. So that IE version will support for Hyperion 11.1.2.3.500 version.
Otherwise, you can install supported firefox version and add Remote XUL Manager to the browser. You can access Hyperion URLs without any issues in this scenario also. Firefox, you can find in support matrix.
Thanks,
Madhusudhan