Not possible to connect with RDP on Windows 11 Arm64 VM

Question

I have crated my first Win 11 ARM64 virtual machine in Azure. After two days a RDP connection was not possible anymore. I have deleted and created a new one but the problem still exists. Port check show "accessible", and other Win x64 VMs are accesible too, but Win 11 ARM64 not . What could be a problem?

Answer 1

Hello, @79064419 !

Why am I suddenly not able to RDP on my Windows 11 VM?

There are several possible causes for this including a couple Windows 11 specific issues. For a full list, refer to Azure VM RDP troubleshooting:

https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/troubleshoot-rdp-connection

From your description, I would start with the following:

• Known Windows 11 22H2 issue: The 22H2 update caused an issue with RDP connections that prevents clients from connecting. This is resolved by disabling UDP using the registry:

From nanosani:
HKEY_LOCAL_MACHINE \ SOFTWARE \ Policies \ Microsoft \ Windows NT \ Terminal Services \ Client   Look for fClientDisableUDP. If you can't find it, create a new DWORD entry and set its value to 1.

(Source 1, Source 2, Source 3)

• Reset your RDP connection. This troubleshooting step resets the RDP configuration when Remote Connections are disabled or Windows Firewall rules are blocking RDP, for example.
• Verify Network Security Group rules. Less likely in this scenario, but worth confirming that there isn't an NSG issue. Use IP flow verify to confirm if a rule in a Network Security Group is blocking traffic to or from a virtual machine.

Try those first. If that doesn't work, then I would work through the rest of the RDP troubleshooting list to rule out possible causes. If you complete the troubleshooting list and are still running into issues, let us know in the comments so we can continue to work through this.

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