After the ssl_connect() function opened a secure connection, the attempt by the client application to send the first packet to the PowerExchange Listener failed because the Listener connection was in the wrong mode. This error occurs if the PowerExchange Listener is verifying certificates to satisfy AT-TLS rules or if the SSL_REQ_SRVR_CERT=Y statement is specified in the DBMOVER configuration file and the following conditions exist:

The ssl_connect() function succeeds.
The Listener completes the ssl_accept() function successfully, receives the subject certificate, and then rejects the certificate.
The Listener switches the connection from receive mode to send mode to send an error packet.