As of now this is not possible in the current version of DB Connect.
I opened an enhancement request (DBX-564) that we'll consider for a later version of the app.
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This is indicating that a plaintext connection is being made to splunkd when it's expecting an SSL connection. Have you set enableSplunkdSSL to false in $SPLUNK_HOME/etc/system/local/server.conf? Or changed the splunkd certificate or cipher suite?
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