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UCEERR_TRANSPORTDISCONNECTED
UCEERR_TRANSPORTDISCONNECTED is a Windows User Composition Engine (UCE) HRESULT. It indicates that the rendering channel lost its transport connection while composition work was pending.
What to check for UCEERR_TRANSPORTDISCONNECTED
- Check for render-thread failure, device reset, session change, window destruction, or application shutdown.
- Discard pending work tied to the disconnected channel and recreate resources after the UI context is valid again.
- Capture the first failure in the chain because later transport errors are often secondary.
Microsoft guidance for WPF render-thread failures
Diagnostic interpretation
This result has the HRESULT value 0x88980421. 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 / transportdisconnected operation.
- Reproduce this result with the smallest valid input and note whether the result changes with identity, architecture, service state, or target object.
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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