3.3.5.5 Connection Close

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Either client or server can close the connection at any time. Typically, the RDG client closes the connection based on user input. The RDG server MAY also close the connection on an administrator-initiated disconnect. An error condition on the RDG server or RDG client also causes the connection to be closed. Closing a connection involves two phases: closing the channel and closing the tunnel.

  • A channel close indicates that no more RDP data will flow on that connection unless a new channel is created. The tunnel is still active and can handle other protocol messages such as keep-alive packets, service messages, and so on.

  • A tunnel close indicates an HTTP disconnection. A tunnel close is initiated only after all channels have been closed. Tunnel and channel close are initiated by either client or server. If both sides simultaneously try to send close messages, the tie is broken in the following priority order:

    • A tunnel close takes precedence over a channel close.

    • A close message from the client takes precedence over a close message from the server.