10000 docs: warn about RDP over UDP with Coder Desktop by spikecurtis · Pull Request #18354 · coder/coder · GitHub
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docs: warn about RDP over UDP with Coder Desktop #18354

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Jun 16, 2025
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docs: warn about RDP over UDP with Coder Desktop #18354

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docs: warn about RDP over UDP with Coder Desktop
spikecurtis Jun 13, 2025
57e2743
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spikecurtis Jun 16, 2025
4a2adab
drop 2nd port-forwarding and run fmt
spikecurtis Jun 16, 2025
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spikecurtis committed Jun 16, 2025
commit 57e2743d92504e8054802596754406d405af312c
26 changes: 17 additions & 9 deletions docs/user-guides/workspace-access/remote-desktops.md
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Expand Up @@ -47,18 +47,26 @@ Or use your favorite RDP client to connect to `localhost:3399`.

The default username is `Administrator` and password is `coderRDP!`.

### Coder Desktop (Beta)
### RDP with Coder Desktop (Beta)

[Coder Desktop](../desktop)'s _Coder Connect_ feature creates a connection to your workspaces in the background. There
is no need for port forwarding when enabled. Use your favorite RDP client to connect to `<workspace-name>.coder` instead
of `localhost:3399`.
[Coder Desktop](../desktop/index.md)'s Coder Connect feature creates a connection to your workspaces in the background.
There is no need for port forwarding when it is enabled.

Use your favorite RDP client to connect to `<workspace-name>.coder` instead of `localhost:3399`.

> [!NOTE]
> We have identified that some versions of Windows, including Windows Server 2022, do not communicate correctly over UDP
> when using Coder Connect as they do not respect the maximum transmission unit (MTU) of the link. When this happens the
> RDP client will appear to connect, but show a blank screen. We recommend you
> [disable RDP over UDP on your Windows workspaces](https://github.com/coder/registry/blob/b58bfebcf3bcdcde4f06a183f92eb3e01842d270/registry/coder/modules/windows-rdp/powershell-installation-script.tftpl#L22).
> Coder's [Windows RDP](https://registry.coder.com/modules/windows-rdp) module does this automatically.
> Some versions of Windows, including Windows Server 2022, do not communicate correctly over UDP
> when using Coder Connect because they do not respect the maximum transmission unit (MTU) of the link.
> When this happens the RDP client will appear to connect, but displays a blank screen.
>
> To avoid this error, Coder's [Windows RDP](https://registry.coder.com/modules/windows-rdp) module
> [disables RDP over UDP automatically](https://github.com/coder/registry/blob/b58bfebcf3bcdcde4f06a183f92eb3e01842d270/registry/coder/modules/windows-rdp/powershell-installation-script.tftpl#L22).
>
> To manually disable RDP over UDP, run the following in PowerShell:
>
> ```powershell
> New-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services' -Name "SelectTransport" -Value 1 -PropertyType DWORD -Force
> ```

You can also use a URI handler to directly launch an RDP session without setting up port-forwarding.

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