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windows-365/enterprise/rdp-shortpath-public-networks.md

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# Use RDP Shortpath for public networks (preview) with Windows 365 
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You can now use Remote Desktop Protocol (RDP) Shortpath for public networks with your Windows 365 Cloud PCs. RPD Shortpath for public networks can provide an additional connection path for improved Cloud PC connectivity, especially in suboptimal network conditions.
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You can now use Remote Desktop Protocol (RDP) Shortpath for public networks with your Windows 365 Cloud PCs. RPD Shortpath for public networks can provide another connection path for improved Cloud PC connectivity, especially in suboptimal network conditions.
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## Requirements
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[Enabling the preview of RDP Shortpath for public networks](/azure/virtual-desktop/shortpath-public#enabling-the-preview-of-rdp-shortpath-for-public-networks).
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## Verify UDP connectivity
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UDP connectivity can be checked within the “Connection Information” section of a Remote session. For more information, see [Verify your network connectivity]( /azure/virtual-desktop/shortpath-public#verify-your-network-connectivity).
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## RDP shortpath benefit
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## RDP Shortpath benefits
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The default connectivity to a Windows 365 Cloud PC is through a TCP connection that traverses a gateway using the [reverse connect](/azure/virtual-desktop/network-connectivity) transport. The reverse transport means that there’s no need for inbound connectivity to the session host (Cloud PC) to connect RDP traffic.
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When using RPD Shortpath, the connection with the Cloud PC proceeds as follows:
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1.The RDP connection establishes a TCP-based connection using the reverse connect transport through the Gateway (in the same way as it does for connectivity without UDP shortpath).
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2.If RDP Shortpath is enabled on the session host (Cloud PC), the service creates a UDP socket on all viable network interfaces.
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3.To test connectivity, the service attempts to connect to a Windows 365 STUN server on the public internet through UDP port 3478. This also establishes the external IP address of the NAT router.
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4.The session host’s candidate table lists the public IP and listener port that it has reachable connectivity on. This information is provided to the connecting client through the established TCP session.
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5.The client sends its list of reachable public IP addresses/ports to the session host.
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6.Both parties attempt a connection at the same time. Because both are creating outbound connections, this often allows connectivity to be established through firewalls because no inbound initiated connectivity occurs.
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7. If connectivity is successful, the service evaluates if the connection is the fastest path. If iti s, all dynamic virtual channels (such as graphics, input, device redirection, and more) switch to the new transport flow.
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1. The RDP connection establishes a TCP-based connection using the reverse connect transport through the Gateway (in the same way as it does for connectivity without UDP shortpath).
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2. If RDP Shortpath is enabled on the session host (Cloud PC), the service creates a UDP socket on all viable network interfaces.
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3. To test connectivity, the service attempts to connect to a Windows 365 STUN server on the public internet through UDP port 3478. This step also establishes the external IP address of the NAT router.
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4. The session host’s candidate table lists the public IP and listener port that it has reachable connectivity on. This information is provided to the connecting client through the established TCP session.
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5. The client sends its list of reachable public IP addresses/ports to the session host.
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6. Both parties attempt a connection at the same time. Because both are creating outbound connections, this often allows connectivity to be established through firewalls because no inbound initiated connectivity occurs.
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7. If connectivity is successful, the service evaluates if the connection is the fastest path. If it is, all dynamic virtual channels (such as graphics, input, device redirection, and more) switch to the new transport flow.
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## Known issues
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The RDP Shortpath for public networks may not work with Cloud PCs in the following scenarios:
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- Where double NAT is in place. For example, if the traffic is routed through a Secure Web Gateway (SWG) or proxy where the connection is NATTed twice (first, on egress from Azure and, second, from the VPN/SWG endpoint.)
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- Where the connection is routed through an internet proxy or other inspection device.
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- Any network which restricts UDP access or limits access to specific ports or IP ranges.
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- Any network that restricts UDP access or limits access to specific ports or IP ranges.
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- Where Carrier Grade NAT (CGN) is used. Where the network shares a public IP address with other networks.
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For more technical details on these scenarios, see [General recommendatins](/azure/virtual-desktop/shortpath-public#general-recommendations).
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For more technical details on these scenarios, see [General recommendations](/azure/virtual-desktop/shortpath-public#general-recommendations).
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## Next steps
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