How to manage the transport protocol to be used for RAS RDSH, VDI Guest VM or Remote PC session

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Feature description

RDP Shortpath establishes direct UDP-based connection between a remote desktop client and session host. Direct connection reduces the dependency on the Azure Virtual Desktop gateways, improves the connection reliability, and increases the bandwidth available for each user session. This applies to RDP and RAS connections. A session host requires a restart for this setting to become effective. To allow access to the RDP Shortpath listener across network security boundaries, Azure Network Security Group must be configured to allow inbound UDP port 3390. VPN or ExpressRoute is required or each session host should have public IP address.

RDP Shortpath

Click the Configure button to enable and configure RDP Shortpath:

Manage RDP transport protocol

Selects the transport protocol that will be used for connections between Parallels Client and a server. To do this:

Use case

UDP over TCP gives a better overall performance in a session, including :

On the other hand, TCP has embedded features which provide error checks and restoration under bad network conditions.

Transport Latency Performance Error check Self-recovery
UDP + + - -
TCP - - + +

There are the following ways to verify which protocol is utilized by the RAS session:


By design initial session is established with TCP, and after mutual negotiations client-server might switch to UDP, so there are at least several requirements to be met:

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