Microsoft Skype for Business Server 2015
James, well you solved the lyncdiscover issue right here. And, maybe that would also solve the monitor. When answering the iapp question about mobile access I used skype.domain.com. But as you explain the that question, it would have to be lyncdiscover.domain.com. I thought there was likely something that I was not answering as the iapp expected.
For the iRule, just to see if the source of the issue is the same, I tried lyncdiscover. instead of skype. and the return is still 400 URL must be absolute. But this also could be a value I provided the iapp that is not what the iapp is looking for.
Maybe this is just my interpreting the questions, or misinterpreting them. I didn't answer with lyncdisocver.domain.com because I don't believe that is optional.
For the monitor, my issue is that without changing anything the monitor returns 400 and fails, showing my reverse proxy server as down. This is for both virtual servers, 443 and 80. I have not been able to modify the monitor to work so I have used the default f5 https and http monitor.