This message primarily means that a TCP connection was initiated on a port that MassTransit was listening on (typically port 50000). After MassTransit has opened the socket, it begins to “probe” the remote destination for authentication. Here, it is determined whether the remote side is a legitimate MassTransit contact, and further, which contact is calling. If no information is passed during this “probing period,” the connection will eventually time out and produce this error message.
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