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3.1.5.1.1 Sending of MCS Disconnect Provider Ultimatum PDU

The structure and fields of the MCS Disconnect Provider Ultimatum PDU are specified in section 2.2.2.3.

The tpktHeader field is initialized as specified in [T123] section 8, while the x224Data field (which contains an X.224 Class 0 Data TPDU) is initialized as specified in [X224] section 13.7.

The MCS Disconnect Provider Ultimatum PDU (embedded within the mcsDPum field) is specified in [T125] section 7, part 4. Only the rn-provider-initiated (1) or rn-user-requested (3) reason codes MUST be used in the reason field.

  • In the case of a user-initiated client-side disconnection (section 1.3.1.4.1), the reason code set by the client MUST be rn-user-requested (3).

  • In the case of a user-initiated server-side disconnection (section 1.3.1.4.2), the reason code set by the server MUST be rn-user-requested (3).

  • In the case of an administrator-initiated server-side disconnection (section 1.3.1.4.3), the reason code set by the server MUST be rn-provider-initiated (1).

If Enhanced RDP Security (section 5.4) is in effect, the External Security Protocol (section 5.4.5) MUST be used to encrypt the entire PDU and generate a verification digest before the PDU is transmitted over the wire.

Once the MCS Disconnect Provider Ultimatum PDU has been sent, the network connection MUST be closed.

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