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There are a few steps that need to be followed when connecting a client to server running the protobuf interface.

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Version Identification

The handshake message is version identification messages are used to fully establish the major and minor version of the protocol in use on the connection. The first message sent from a client to a server must be a handshakeNewConnectionClientVersion. Once the server accepts the client's handshakeversion, it will guarantee that its response messages match the client's protocol version, regardless of the version of protobuf being run on the server.

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