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Azure AD Application Proxy - Remote Desktop Services (RDS) RDP UDP Support

Brass Contributor

A client uses an AAD app proxy to publish RDS and followed these Microsoft docs to set everything up ...


Users authenticate against the remote desktop gateway to then access VMs that are hosted on-prem. Users now report that RDP sessions are somewhat slow and laggy with the sessions freezing every 10-20s for 1-2s.

We've checked the entire environment and found out that RDP sessions are using UDP 3391 but TCP 443.


There seems to be a limitation with the app proxy being unable to support UDP as first noticed in 2017 (, then again in 2019 ( and again in 2022 (


Can someone comfirm this? Is there an update from Microsoft on when the app proxy might support UDP?

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