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6 Appendix A: Product Behavior

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The information in this specification is applicable to the following Microsoft products or supplemental software. References to product versions include updates to those products.

  • Windows 8 operating system

  • Windows Server 2012 operating system

  • Windows 8.1 operating system

  • Windows Server 2012 R2 operating system

  • Windows 10 operating system

  • Windows Server 2016 operating system

  • Windows Server operating system

  • Windows Server 2019 operating system

  • Windows Server 2022 operating system

  • Windows 11 operating system

  • Windows Server 2025 operating system

Exceptions, if any, are noted in this section. If an update version, service pack or Knowledge Base (KB) number appears with a product name, the behavior changed in that update. The new behavior also applies to subsequent updates unless otherwise specified. If a product edition appears with the product version, behavior is different in that product edition.

Unless otherwise specified, any statement of optional behavior in this specification that is prescribed using the terms "SHOULD" or "SHOULD NOT" implies product behavior in accordance with the SHOULD or SHOULD NOT prescription. Unless otherwise specified, the term "MAY" implies that the product does not follow the prescription.

<1> Section 2.2.2.9:  Windows 8 and Windows Server 2012 support version 1 of the RDP-UDP protocol.

<2> Section 2.2.2.9:  Windows 8.1 and Windows Server 2012 R2 support version 1 and version 2 of the RDP-UDP protocol, and are the first product versions to send the RDPUDP_SYNDATAEX_PAYLOAD structure.

<3> Section 3.1.1.4:  The Remote Desktop Protocol: UDP Transport Extension generates one ACK for every two Source Packets received from the sender.

<4> Section 3.1.1.9:  The Remote Desktop Protocol: UDP Transport Extension generates four keep-alive datagrams every 65 seconds when the transport is quiescent.

<5> Section 3.1.5.2:  The Remote Desktop Protocol: UDP Transport Extension retransmits SYN and SYN+ACK packets three times, with a time-out of 800 ms, before terminating the connection.

<6> Section 3.1.5.2:  The Remote Desktop Protocol: UDP Transport Extension retransmits SYN and SYN+ACK packets three times, with a time-out of 800 ms, before terminating the connection.

<7> Section 3.1.5.4.1:  The Remote Desktop Protocol: UDP Transport Extension retransmits datagrams five times before terminating the connection.

<8> Section 3.1.6.1:  The Remote Desktop Protocol: UDP Transport Extension doubles the retransmit time-out each time the same packet is retransmitted, up to 120 seconds.