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ERROR_CLUSTER_INVALID_STRING_TERMINATION
An input string of characters is not properly terminated.
ERROR_CLUSTER_INVALID_STRING_TERMINATION is Win32 error 5916 (0x171C) and belongs to Failover clustering cluster string buffer validation. 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 Failover clustering cluster string buffer validation rather than starting with a broad system repair.
Where the result appears
- This result can surface during Failover Cluster management during cluster string buffer validation.
- This result can surface during Cluster service processing where an input character string is not terminated as required by the cluster API contract.
- It can surface during a role or node transition whose evidence includes buffer length in bytes and characters.
- It can surface during automation expected to allocate the documented buffer size, include the terminator, and pass lengths in the units required by the API.
Likely causes
- an input character string is not terminated as required by the cluster API contract.
- the management view for cluster string buffer validation changed before the request committed.
- a concurrent cluster transition invalidated encoding and terminating code unit.
- the caller attempted recovery without first confirming that it could allocate the documented buffer size, include the terminator, and pass lengths in the units required by the API.
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 Failover clustering cluster string buffer validation because a blind retry can hide stale state or repeat a non-idempotent change.
- record buffer length in bytes and characters.
- record encoding and terminating code unit.
- record structure field containing the string.
- record marshaling layer and caller architecture.
- record UTC timestamp, cluster functional level, and the cluster string buffer validation transition generation.
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 5916, hexadecimal 0x171C, and the producing API even when a localized message is also shown.
State boundary to prove
The decisive boundary for it is whether an input character string is not terminated as required by the cluster API contract. Prove or disprove that proposition using buffer length in bytes and characters together with encoding and terminating code unit. 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: a native wrapper copies a maximum-length name without space for the final UTF-16 null, and cluster validation rejects it. The negative case should keep the responsible condition unchanged and confirm error 5916; the recovery case should change only that condition and verify a successful result without an unrecorded side effect.
Suggested diagnostic fields
For error 5916, keep winerr_5916_api, winerr_5916_object, winerr_5916_state_before, winerr_5916_request, winerr_5916_first_status, winerr_5916_verification. These fields distinguish the initial state, requested transition, first status, and verified recovery result.
Handling, retry, and recovery
Allocate the documented buffer size, include the terminator, and pass lengths in the units required by the api. Generate a focused cluster log for the failure window and preserve the first error rather than only the final management message.
Retry it only after evidence shows a change in Failover clustering cluster string buffer validation. 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 5916, hexadecimal
0x171C, and the producing API. - log the target object and observed Failover clustering cluster string buffer validation 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
It names the cluster-specific boundary for cluster string buffer validation; a generic Win32 paraphrase would lose the object and transition context.
Practical example
A native wrapper copies a maximum-length name without space for the final UTF-16 null, and cluster validation rejects it.
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 5916, 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 5916.
- Microsoft: Failover clustering documentation — reference for error 5916.
- Microsoft: Get-ClusterLog — reference for error 5916.
- Microsoft: Troubleshoot unexpected cluster failover — reference for error 5916.
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