@osasfrancis
I did some tests in order to reproduce the issue. What I did was:
1. Blocked my Splunk server to contact any URLs out of my network.
2. Tried to ping my ServiceNow instance (which is outside of my network) from the command prompt. As expected, ping was unsuccessful.
3. Installed the ServiceNow add-on on my Splunk server and tried to configure it.
As a result of the above test, I was successfully able to reproduce the issue which you are facing.
Hence I am pretty much sure that your Splunk server is somehow not able to reach your ServiceNow instance.
In order to get familiar with the Ping command, you follow this guide: https://iihelp.iinet.net.au/How_to_run_a_ping_test
The command that is mentioned in the above guide works similarly in Windows, Linux, and macOS command prompts.
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