SSL LTM issue

Hey all -

This is going to likely be a DUMB question, but it's Monday, and the coffee is still sinking into my head.

I'm working on setting up my first SSL system behind our newly deployed F5's. Initially I had just set a port 443 monitor, but the boss wants something a bit more robust.

So, started working through this guide: https://www.f5.com/pdf/deployment-guides/f5-microsoft-remote-desktop-services-dg.pdf

and I did the configuration that was specified on page 17. I created a health monitor to do the following:

GET /RDWeb/Pages/en-US/login.aspx HTTP/1.1\r\nHost: rdwa.example.com\r\nConnection: Close\r\n\r\n

(should return 200 OK).

I've done similar get/return strings on standard non-ssl port 80 websites. However, this one doesn't work. If I pull the page in Postman, I can get the page source returned with no issue.

So, my dumb question:

Do I need to load a certificate onto the F5 for the new hostname, or the client machines behind this config for this to work correctly? I don't have a cert for either at the moment, so I know that part is missing on my config. But right now i'm just trying to get the monitor working.