Splunk Cloud Free Trial: certificate verify failed (self signed certificate in certificate chain) error message



I am evaluating Splunk Cloud (Free Trial for now) and running into the problem while submitting logs to HEC:


SSL_connect returned=1 errno=0 state=error: certificate verify failed (self signed certificate in certificate chain) (OpenSSL::SSL::SSLError)


This is a Ruby on Rails application configured to use HTTPS HEC endpoint and using a self-signed certificate.  Everything works normally when SSL verification mode set to none. The certificate is good since I could use it to establish an HTTPS connection to some other non-splunk endpoints. So I guess something on Splunk side rejecting self-signed certificates. Unfortunately, I cannot find any Splunk UI to manage this behavior, probably because it is a Free Trial. So my questions are: am I am missing some settings in UI? Or it is configurable in non Trial mode? Or it just requires a non-self-signed certificate?



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