Check for errors on both sides of the connection. If this was indeed a message from the server, which would mean that the client interrupted the connection, it would typically mean SSL misconfiguration. In such a case the client would attempt to connect to the server, the server would accept the TCP connection, at least one party would start the TLS handshake but - especially if the TLS was enabled on the client and disabled on the server - if the client couldn't agree with the server on TLS parameters, it would drop the connection. So make sure that TLS parameters are the same on both sides.
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