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There is only one true retransmission in your capture file, the rest are simply duplicate packets causing those and the duplicate ACKs. See more about this phenomenon here:

The reason for the reset is hard to say - there's not that much to see in the packets, but it's not a network issue at all, because the network transports the packets just fine. My guess is that either the connection was finished in a good way, or something happened that can't be told from the packets, at least not without more insight into what the conversation was doing (as it's not the usual Telnet shell stuff).