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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.