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ERROR_APP_DATA_REBOOT_REQUIRED
Fast Cache has been ReArmed and requires a reboot until it can be updated.
ERROR_APP_DATA_REBOOT_REQUIRED is Win32 error 4404 (0x1134) and belongs to Fast Cache rearm completion. The system description identifies the immediate condition but does not identify the caller, object, policy, device, service instance, or transition that produced it.
Interpret this result at the API boundary that returned it. Capture it before logging, cleanup, or another Windows call can replace the thread-local last-error value. Compare the recorded inputs with the documented precondition for Fast Cache rearm completion rather than starting with a broad system repair.
Where the result appears
- This result can surface during Fast Cache rearm after servicing or policy change.
- This result can surface during an application attempting updates before the rearm takes effect.
- It can surface during deployment automation validating cache readiness.
- It can surface during post-maintenance startup where pending reboot state remains.
Likely causes
- the cache was rearmed and Windows requires a restart to finish the transition.
- servicing changed low-level cache state that cannot be switched live.
- automation ignored the reboot-required success condition.
- multiple maintenance steps accumulated a pending restart.
Diagnostic sequence
Diagnosis of it starts with the exact request type: read, write, create, transition, validation, cancellation, or administrative action. Identify the object generation and subsystem owner, then decide whether the failure happened before side effects, during a partial transition, or after completion. This ordering matters in Fast Cache rearm completion because a blind retry can hide stale state or repeat a non-idempotent change.
- record rearm command result and timestamp.
- record pending reboot indicators and servicing events.
- record current cache mode before and after restart.
- record applications still holding cache resources.
- record whether the restart actually completed rather than hibernated.
Correlate it with the owning component’s operational log, the Windows System log, and any subsystem trace. Telemetry for it should preserve native identifiers such as a path or file ID, handle generation, node or peer identity, policy ID, object version, offset and length, or transaction token. Retain decimal 4404, hexadecimal 0x1134, and the producing API even when a localized message is also shown.
State boundary to prove
The decisive boundary for it is whether the cache was rearmed and Windows requires a restart to finish the transition. Prove or disprove that proposition using rearm command result and timestamp together with pending reboot indicators and servicing events. When observations for it disagree, preserve both and inspect the transition between them instead of choosing the more convenient value.
A focused validation for it should recreate the relevant part of this situation: deployment re-arms Fast Cache and immediately runs a write validation. Recognizing the reboot-required code lets orchestration restart first and test afterward. The negative case should keep the responsible condition unchanged and confirm error 4404; the recovery case should change only that condition and verify a successful result without an unrecorded side effect.
Handling, retry, and recovery
Schedule a controlled reboot, preserve user work, and verify cache readiness after a full restart. Repeating update calls before reboot will not complete the pending transition.
Retry it only after evidence shows a change in Fast Cache rearm completion. Initialization, asynchronous completion, recall, or service readiness can justify bounded backoff; malformed metadata, invalid identifiers, policy rejection, unsupported versions, and integrity failures require correction. Before repeating a write or configuration operation after it, query completion state explicitly.
What to log for support and telemetry
- log decimal 4404, hexadecimal
0x1134, and the producing API. - log the target object and observed Fast Cache rearm completion state.
- log caller identity, process and thread IDs, machine or node identity, and UTC time.
- log attempt number, elapsed time, previous result, and any partial side effect.
- retain the first lower-level or component-specific error before Win32 translation.
Difference from nearby codes
This code is an actionable pending-reboot state, not proof that cached application data is corrupt or missing.
Practical example
Deployment re-arms Fast Cache and immediately runs a write validation.
Developer and administrator guidance
Code that handles it should keep its Win32 domain visible across exceptions, RPC responses, and JSON or REST wrappers. Administrators should verify the subsystem evidence before changing policy, deleting state, forcing failover, or replacing storage. Recovery is demonstrated only when a test observes 4404, changes the responsible condition, and confirms that the same operation succeeds without hidden data loss.
References
- Microsoft: System Error Codes (4000–5999) — reference for error 4404.
- Microsoft: Storage management — reference for error 4404.
- Microsoft: Troubleshoot data corruption and disk errors — reference for error 4404.
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