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ERROR_TIMEOUT
The operation exceeded its timeout period.
ERROR_TIMEOUT is Win32 error 1460 (0x5B4). It is a generic deadline result used by many Windows components. The code does not by itself say whether the underlying work failed, is still running, was canceled, or completed after the caller stopped waiting. Correct interpretation requires the originating API and its timeout contract.
Questions that determine severity
- is the timeout measured for connection, response, lock acquisition, I/O, or total operation time?
- does the API cancel work automatically or leave it outstanding?
- can the operation have side effects even when the caller receives 1460?
- was the configured deadline realistic for the workload and network path?
- did contention, suspension, clock changes, or resource pressure delay progress?
Telemetry to capture
Record start and deadline timestamps from a monotonic clock, elapsed duration, timeout value, operation ID, target, retry number, queue delay, execution phase, cancellation result, and eventual completion if observable. For network work, include DNS, connect, TLS, first-byte, and transfer timings rather than one aggregate number.
Diagnostic sequence
Identify the precise stage that consumed the budget. Inspect server or peer logs using the shared operation ID. Determine whether the request reached the target and whether a late response was discarded. For synchronization waits, capture the owner and duration of the contested resource.
Review timeout composition. Nested layers can each spend the full parent timeout, or a retry loop can reset the budget and greatly exceed the user-visible deadline. Prefer one absolute deadline propagated through the call chain. Confirm that cancellation is acknowledged before resources or buffers are reused.
Retry and recovery
Retry only operations that are safe to repeat or carry an idempotency key. Use bounded backoff and preserve the original deadline for interactive work. When side effects are uncertain, query operation status before resubmitting. Raising the timeout can be valid for a known long operation, but it should not hide deadlocks or queue growth.
Difference from wait status values
WAIT_TIMEOUT is the direct wait-function status value 258, while error 1460 is a Win32 error used by broader APIs and components. Logs should preserve the original API result rather than converting all deadline outcomes to one generic label.
Example
A deployment client waits 30 seconds for a server operation that continues after disconnect. It retries immediately and starts a duplicate deployment. Adding an operation ID, querying the first request after timeout, and retrying only when the server confirms no execution prevents duplicate changes.
References
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