Duo Splunk Connector: How do I resolve this setup error message?

[john_byun]

After entering all of the Duo Admin API info (integration key, secret key, host) I get the following error message when I hit Next and cannot proceed.

Encountered the following error while trying to save: Splunkd daemon is not responding: ("Error connecting to /servicesNS/admin/search/data/inputs/duo_input: ('The read operation timed out',)",)

If I navigate to splunk:8089/servicesNS in a web browser, I see the following:
This XML file does not appear to have any style information associated with it. The document tree is shown below.
Not Found

Does anyone know what the problem might be and how I can fix it?

[thelucas]

Take a look at my solution here, you may be having the same issue:
https://answers.splunk.com/answers/609211/how-do-i-change-the-rest-api-execution-timeout.html