Hello friend, I have experienced the same issues and would like to share how to resolve them. I carefully executed the following steps precisely in that order to make it work. 1. Add the splunk user to docker group on host machine $ sudo usermod -aG docker splunk 2. Create self-signed certificates and create the server certificates https://docs.splunk.com/Documentation/Splunk/8.2.1/Security/Howtoself-signcertificates 3. Create a single PEM file https://docs.splunk.com/Documentation/Splunk/8.2.1/Security/HowtoprepareyoursignedcertificatesforSplunk 4. Configure indexers to use a signed certificates https://docs.splunk.com/Documentation/Splunk/8.2.1/Security/ConfigureSplunkforwardingtousesignedcertificates After applying those configurations to our single-instance the DLTK Endpoint URL() is not HTTPS error was resolved. Hope that helps 😉
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