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UCEERR_TRANSPORTOVERLOADED
UCEERR_TRANSPORTOVERLOADED is a Windows User Composition Engine (UCE) HRESULT. It indicates that the composition channel cannot keep up with the volume of pending graphics or visual-update traffic.
What to check for UCEERR_TRANSPORTOVERLOADED
- Profile high-frequency property changes, animation, layout invalidation, and rendering callbacks.
- Coalesce frequent updates and avoid generating work faster than the rendering channel can consume it.
- Check for a blocked renderer or GPU issue if the workload is normally modest.
Microsoft guidance for WPF render-thread failures
Diagnostic interpretation of UCEERR_TRANSPORTOVERLOADED
UCEERR_TRANSPORTOVERLOADED has the HRESULT value 0x88980422. AllStat records the condition as “UCEERR_TRANSPORTOVERLOADED”. For UCEERR_TRANSPORTOVERLOADED, in practice, interpret that wording at the boundary owned by the Windows component or COM interface that returned the HRESULT, rather than treating the value as a generic Windows message.
Evidence to capture for UCEERR_TRANSPORTOVERLOADED
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0x88980422 value before a wrapper converts it to an exception or Boolean result.
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions UCEERR_TRANSPORTOVERLOADED or the uceerr / transportoverloaded operation.
- For UCEERR_TRANSPORTOVERLOADED, compare the failing machine with a working one at the same configuration boundary: component version, policy, registration, identity, and target resource.
Retry and recovery for UCEERR_TRANSPORTOVERLOADED
Retry UCEERR_TRANSPORTOVERLOADED only when the owning API documents a transient state or after the condition described as “UCEERR_TRANSPORTOVERLOADED” has changed. For UCEERR_TRANSPORTOVERLOADED, configuration, policy, format, and authorization failures normally require correction first; an immediate loop can hide the original call site and add secondary errors.
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