What does HRESULT 0x88980421 (UCEERR_TRANSPORTDISCONNECTED) mean?

 
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UCEERR_GRAPHICSSTREAMALREADYOPEN UCEERR_TRANSPORTOVERLOADED

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


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