rabbitmq-management works on server, but not from my workstation

[Michael Bray]

Hi, 

I have a rabbitmq 3.9.7 installation running with rabbitmq-management plugin enabled.  If I open http://localhost:15697/ from the server running rabbitmq, then I get the management console login screen, I can log in, and I can see all of the management tabs and statistics - everything works great.  

But when I try to load http://my_rabbit_servername:15697/ from my development workstation, I get the login screen, I can log in, but the management console appears broken.  I don't see the "Overview // Connections // Channels // Exchanges // Queues // Admin" header at all, nor any of the content, but I do see the RabbitMQ header and login information (Cluster XYZ, User ABC [logout]) and I do see the footer "HTTP API // Server Docs // Tutorials // Community Support // ...etc...".  In the developer console, I see the following error:
[Mon May 16 2022 16:28:01 GMT-0400 (Eastern Daylight Time)] body 404 Not Found get /  Error: 404 Not Found get /
    at Sammy.Application.error (sammy-0.7.6.min.js:5:16541)
    at Sammy.Application.notFound (sammy-0.7.6.min.js:5:16392)
    at Sammy.Application.runRoute (sammy-0.7.6.min.js:5:14714)
    at Sammy.Application._checkLocation (sammy-0.7.6.min.js:5:17004)
    at Sammy.Application.run (sammy-0.7.6.min.js:5:11353)
    at start_app_login (main.js:76:13)
    at HTMLDocument.<anonymous> (main.js:13:9)
    at e (jquery-3.5.1.min.js:2:30005)
    at t (jquery-3.5.1.min.js:2:30307)

However, some strange details:

1. This failure only occurs in Chrome and Edge when running on my workstation.  On my workstation, the old Internet Exploder actually works!  So it can't be a firewall issue...  
2. Chrome works fine when I load it on the server, although I still get the error messages in the console.  I originally was using the built-in IE, which is the ONLY reason I even tried IE on my workstation.

Summary:

WORKS = Any browser on the server, or IE on my workstation

DOES NOT WORK = Chrome/Edge on my workstation, even in Incognito mode with no plugins enabled

I don't really want to use IE nor have to RDP into the server to see the management console.  Any ideas??