Load balancing ADFS proxy servers with keepalive

Was not satisfied with the configuration I ended up using, but it was the best I could get working. I am running 11.3.0 build 3117.0 Hotfix HF5. I could not get keepalive working to ADFS servers using a valid AD account. The keepalive configuration required user name and password, but found out it could be anything and the password could be anything, but you had to supply something, I suspect a bug in the F5 code due to this behavior. Keepalive Send string: GET /adfs/fs/federationserverservice.asmx HTTP/1.1\r\nHost: \r\nConnection: Close\r\n\r\n Keepalive Receive string: HTTP/1.1\s200\sOK

Would like to know why I can't get keepalive to pass a valid AD account and get a validated response.

For ADFS proxy server I ended up using the following keepalive. Send string: GET /\r\n