PROBLEM: Pool Member Won't Work Through Big IP LTM

There should only be one NIC on the server. I assume/say that because it is a virtual machine, plus the fact that it seems to work from every other client. Right now the F5 seems to successfully execute the curl against the server IP so I'm hoping that will fail soon so I can try seeing how other things react. For example, a network admin installed IIS on a different port so we can see if it's the Oracle aspect that's somehow breaking down.

 

 

But I just don't get it. Even when the curl doesn't work, the HTTP health monitor seems to have no issue passing. The only thing I haven't done is modified it so it's looking for a specific response from the server, it's just doing the default GET / with a blank response string.

 

 

I mean despite the communication being off/on between F5 and the server in SSH, the fact is it generally does work. So why does going through the virtual server fail 100% of the time? What's different?