I figured out my issue. First, the server and my admin logon do not have internet access.
From my desktop, I can browse to the Splunk console.
It turns out the network I'm in has an odd problem. From my desktop, I can get out where I need to. But, if I RDP to any devices using my admin logon (which is restricted) my desktop somehow inherits that restriction and I can't get out at all. After I disconnect that restrictive RDP session and wait a few minutes; all is well. I was able to install the Palo Alto App and Plug In.
Now, to figure out how to configure that.
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