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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 interpretation
This result has the HRESULT value 0x88980418. AllStat records the condition as “it”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the uceerr / commandtransportdenied operation.
- compare the failing machine with a working one at the same configuration boundary: component version, policy, registration, identity, and target resource.
Retry and recovery
Retry this result only when the owning API documents a transient state or after the condition described as “it” has changed.
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