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UCEERR_COMMANDTRANSPORTDENIED
UCEERR_COMMANDTRANSPORTDENIED is a Windows User Composition Engine (UCE) HRESULT. It indicates that the transport rejected a composition command because it is not permitted in the current channel or security context.
What to check for UCEERR_COMMANDTRANSPORTDENIED
- Check the session, process, and UI-context boundaries involved in the rendering operation.
- Avoid sending visual updates after the owning channel has been closed or restricted.
- Inspect earlier channel-state errors to determine why the transport rejected the command.
Microsoft guidance for WPF render-thread failures
Diagnostic discriminator: Confirm the channel/security context in which the composition command was sent. The transport exists but rejects this command as impermissible, which differs from an unavailable or overloaded transport.
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