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8043fefcf6
A TLS handshake requires exchanging multiple messages to initiate a session. If one side decides to close during the handshake, it is supposed to send a close_notify alert (similar to closing during application data exchange). The java SSLEngine engine throws an exception when this happens. We currently log this at the warn level if trace logging is not enabled. This level is too high for a valid scenario. Additionally it happens all the time in tests (quickly closing and opened transports). This commit changes this to be logged at the debug level if trace is not enabled. Additionally, it extracts the transport security exception handling to a common class.