Having this same issue myself trying to add deployment client functionality to existing heavy forwarders. In fact, when I run tcpdumps, I see this error messge in the logs:
"channel=tenantService/handshake Will retry sending handshake message to DS; err=not_connected"
When there are ZERO packets that have gone across the wire. The error is appearing without the DC even attempting to contact the server.
This is with Splunk Enterprise v6.2.2 with the deployment server running on a cluster master. Not concerned about performance here; this is on a dev box just to ahem prove that deployment server works.
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