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MySQL Internals Manual  /  ...  /  Insufficient Client Capabilities Insufficient Client Capabilities

Server will reject connection with ERR_Packet if it discovers that client capabilities are not sufficient to complete authenticaiton. This can happen in the following situations:

In either of these cases authentication phase will look as follows:

  1. the client connecting to the server

  2. the server responds with the Initial Handshake Packet

  3. the client sends the Handshake Response Packet

  4. server recognizes that client does not have enough capabilities to handle required authentication method, sends ERR_Packet and closes connection.