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2.2.1.10 Client Security Exchange PDU

The Security Exchange PDU is an optional RDP Connection Sequence PDU that is sent from client to server during the RDP Security Commencement phase of the RDP Connection Sequence (see section 1.3.1.1 for an overview of the RDP Connection Sequence phases). It is sent after all of the requested MCS Channel Join Confirm PDUs (section 2.2.1.9) have been received.


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tpktHeader

x224Data

mcsSDrq (variable)

...

securityExchangePduData (variable)

...

tpktHeader (4 bytes): A TPKT Header, as specified in [T123] section 8.

x224Data (3 bytes): An X.224 Class 0 Data TPDU, as specified in [X224] section 13.7.

mcsSDrq (variable): Variable-length PER-encoded MCS Domain PDU (DomainMCSPDU) which encapsulates an MCS Send Data Request structure (SDrq, choice 25 from DomainMCSPDU), as specified in [T125] section 11.32 (the ASN.1 structure definitions are given in [T125] section 7, parts 7 and 10). The userData field of the MCS Send Data Request contains a Security Exchange PDU Data (section 2.2.1.10.1) structure.

securityExchangePduData (variable): The actual contents of the Security Exchange PDU, as specified in section 2.2.1.10.1.

 
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