Presumably if you run 'netstat -ano' it shows the Splunk service listening on port 8000, otherwise you wouldn't be able to connect on the local machine. Have you tried serving any other application to check if external hosts can connect (something not on port 8000 obviously). As already stated, I don't think ping is relevant as even with the Windows firewall enabled, ICMP isn't disabled. Can you clarify how your 'STIG' compliant OS is different to standard Windows 10? If you're wanting the most secure machine to host Splunk Enterprise, wouldn't you just go with Server 2019 or Linux (I realise that's an entirely separate topic, but we don't know what security features you've added to Windows 10 for the STIG compliance, so it's difficult to advise what might be blocking traffic).
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