2.2.1.12 Server License Error PDU - Valid Client

The License Error (Valid Client) PDU is an RDP Connection Sequence PDU sent from server to client during the Licensing phase of the RDP Connection Sequence (see section 1.3.1.1 for an overview of the RDP Connection Sequence phases). This licensing PDU indicates that the server will not issue the client a license to store and that the Licensing Phase has ended successfully. This is one possible licensing PDU that can be sent during the Licensing Phase (see [MS-RDPELE] section 2.2.2 for a list of all permissible licensing PDUs).


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tpktHeader

x224Data

mcsSDin (variable)

...

securityHeader (variable)

...

validClientLicenseData (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.

mcsSDin (variable): Variable-length PER-encoded MCS Domain PDU (DomainMCSPDU) which encapsulates an MCS Send Data Indication structure (SDin, choice 26 from DomainMCSPDU), as specified in [T125] section 11.33 (the ASN.1 structure definitions are given in [T125] section 7, parts 7 and 10). The userData field of the MCS Send Data Indication contains a Security Header and a Valid Client License Data (section 2.2.1.12.1) structure.

securityHeader (variable): Security header. The format of the security header depends on the Encryption Level and Encryption Method selected by the server (sections 5.3.2 and 2.2.1.4.3). This field MUST contain one of the following headers:

  • Basic Security Header (section 2.2.8.1.1.2.1) if the Encryption Level selected by the server is ENCRYPTION_LEVEL_NONE (0) or ENCRYPTION_LEVEL_LOW (1) and the embedded flags field does not contain the SEC_ENCRYPT (0x0008) flag.

  • Non-FIPS Security Header (section 2.2.8.1.1.2.2) if the Encryption Method selected by the server is ENCRYPTION_METHOD_40BIT (0x00000001), ENCRYPTION_METHOD_56BIT (0x00000008), or ENCRYPTION_METHOD_128BIT (0x00000002) and the embedded flags field contains the SEC_ENCRYPT (0x0008) flag.

  • FIPS Security Header (section 2.2.8.1.1.2.3) if the Encryption Method selected by the server is ENCRYPTION_METHOD_FIPS (0x00000010) and the embedded flags field contains the SEC_ENCRYPT (0x0008) flag.

If the Encryption Level is set to ENCRYPTION_LEVEL_CLIENT_COMPATIBLE (2), ENCRYPTION_LEVEL_HIGH (3), or ENCRYPTION_LEVEL_FIPS (4) and the flags field of the security header does not contain the SEC_ENCRYPT (0x0008) flag (the licensing PDU is not encrypted), then the field MUST contain a Basic Security Header. This MUST be the case if SEC_LICENSE_ENCRYPT_SC (0x0200) flag was not set on the Security Exchange PDU (section 2.2.1.10).

The flags field of the security header MUST contain the SEC_LICENSE_PKT (0x0080) flag (section 2.2.8.1.1.2.1).

validClientLicenseData (variable): The actual contents of the License Error (Valid Client) PDU, as specified in section 2.2.1.12.1.

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