I'm seeing the same thing. I am new to Splunk and Phantom and wanted to setup a POC using the free versions. I've installed both Splunk (win 2016) and Phantom on Centos 7.4 on Azure on the same subnet.
Connectivity seems to be fine from both servers.
I am simply trying to setup via the Splunk Enterprise "app" under this screen by following the directions on the Phantom Configuration Page.
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