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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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If a server does not require authentication, the client can immediately start sending region operations and is assumed to be authorized for any operation.  If the client tries to authenticate on such a server, it will respond with a AUTHENTICATION_NOT_SUPPORTED error.

Timeouts

The current behavior of the server is that when clients have not sent a message for a minute, the server will be closed. This behavior may change in the future. The currently recommended behavior for clients is to reconnect when a connection is closed.