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UCEERR_TRANSPORTUNAVAILABLE
UCEERR_TRANSPORTUNAVAILABLE is a Windows User Composition Engine (UCE) HRESULT. It indicates that the channel transport required for communication with the composition engine is not available.
What to check for UCEERR_TRANSPORTUNAVAILABLE
- Check session availability, application initialization, and whether the composition target has been created successfully.
- Review any earlier errors that disconnected or prevented creation of the render channel.
- Retry only after restoring the window, dispatcher, and graphics context to a valid state.
Microsoft guidance for WPF render-thread failures
Diagnostic interpretation
This result has the HRESULT value 0x88980416. 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 / transportunavailable 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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