![]() ![]() If the client has a direct connection to the session host, the client establishes a secure connection using TLS over reliable UDP.Īfter establishing the RDP Shortpath transport, all Dynamic Virtual Channels (DVCs), including remote graphics, input, and device redirection, are moved to the new transport. While the client is probing the provided IP addresses, it continues to establish the initial connection over the reverse connect transport to ensure there's no delay in the user connection. The client starts the background thread to establish a parallel UDP-based transport directly to one of the session host's IP addresses. The session host sends the list of its IPv4 and IPv6 addresses to the client. These capabilities are negotiated using the following process: Then, the client and session host establish the initial RDP transport, and start exchanging their capabilities. ![]() The following diagram gives a high-level overview of the network connections when using RDP Shortpath for managed networks and session hosts joined to an Active Directory domain.Īll connections begin by establishing a TCP-based reverse connect transport over the Azure Virtual Desktop Gateway. By default, port 3390 is used, although you can use a different port. ![]() To use RDP Shortpath for managed networks, you must enable a UDP listener on your session hosts. While most TCP-based VPN solutions support nested UDP, they add inherited overhead of TCP congestion control, which slows down RDP performance. If you're using other VPN types to connect to Azure, we recommend using a UDP-based VPN. To learn how RDP Shortpath works for managed networks and public networks, select each of the following tabs. The RDP Shortpath transport allows limiting outbound network traffic by specifying a throttle rate for each session. RDP Shortpath brings support for configuring Quality of Service (QoS) priority for RDP connections through Differentiated Services Code Point (DSCP) marks. The removal of extra relay points reduces round-trip time, which improves connection reliability and user experience with latency-sensitive applications and input methods. Using URCP to enhance UDP achieves the best performance by dynamically learning network parameters and providing the protocol with a rate control mechanism. Using RDP Shortpath has the following key benefits: RDP Shortpath for public networks with TURN is only available in the Azure public cloud. To configure your host pool as a validation environment, see Define your host pool as a validation environment. URCP operates at low delay and loss levels as needed.ĭuring the preview, TURN is only available for connections to session hosts in a validation host pool. URCP enhances UDP with active monitoring of the network conditions and provides fair and full link utilization. The transport used for RDP Shortpath is based on the Universal Rate Control Protocol (URCP). There are two connection types when using a public connection, which are listed here in order of preference:Ī direct UDP connection using the Simple Traversal Underneath NAT (STUN) protocol between a client and session host.Īn indirect UDP connection using the Traversal Using Relay NAT (TURN) protocol with a relay between a client and session host. Public networks, where direct connectivity is established between the client and the session host when using a public connection. Managed networks, where direct connectivity is established between the client and the session host when using a private connection, such as a virtual private network (VPN). UDP-based transport offers better connection reliability and more consistent latency. TCP-based reverse connect transport provides the best compatibility with various networking configurations and has a high success rate for establishing RDP connections. By default, Remote Desktop Protocol (RDP) tries to establish connection using UDP and uses a TCP-based reverse connect transport as a fallback connection mechanism. RDP Shortpath is a feature of Azure Virtual Desktop that establishes a direct UDP-based transport between a supported Windows Remote Desktop client and session host. ![]() See the Supplemental Terms of Use for Microsoft Azure Previews for legal terms that apply to Azure features that are in beta, preview, or otherwise not yet released into general availability.Ĭonnections to Azure Virtual Desktop use Transmission Control Protocol (TCP) or User Datagram Protocol (UDP). Using RDP Shortpath for public networks with TURN for Azure Virtual Desktop is currently in PREVIEW. ![]()
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