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UI_E_TIMER_CLIENT_ALREADY_CONNECTED
The scope of UI_E_TIMER_CLIENT_ALREADY_CONNECTED is Windows Animation Manager: a timer client attempted a second connection without disconnecting the first. Preserve 0x802A010A beside the returning call before cleanup or retry creates a more generic secondary failure.
Read the condition first
The animation timer maintains a client relationship and callback routing. Duplicate registration often signals repeated initialization or cleanup that failed to remove the previous handler.
Keep neighboring conditions separate
UI_E_DIFFERENT_OWNER is object-domain mismatch; this code is duplicate timer-client registration.
Do not create more timers merely to bypass a leaked client registration.
Incident record
- Timer and client identities.
- First connection result.
- Second initialization path.
- Disconnect or release history.
Reproduce without destroying evidence
The investigation should change one variable at a time and keep the original failing sample.
- First: Make connection ownership single and explicit.
- Next: Disconnect before replacing a client.
- Then: Guard initialization with a lifecycle state.
- Finally: Test reopen after complete teardown.
Three useful controls
- Fresh storyboard or animation object: a changed result separates retained object, connection, path, host, or device state from the original input. Hold constant: keep the timeline, transitions, and manager version fixed.
- Reduced failing operation: If this result follows the reduced step, the rejecting transition is localized. Hold constant: retain timer and client identities and remove only unrelated work.
- Targeted corrective control: Use this as a diagnostic branch rather than a blanket workaround: make connection ownership single and explicit. Hold constant: keep the original failing sample available for the final regression test.
Definition of done
Closure requires one client is connected per timer generation and reconnect succeeds after verified disconnection; then repeat the next lifecycle operation to detect stale state.
Technical references
The references below define the API family or storage/protocol behavior used to interpret this result.
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