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ERROR_SMB_BAD_CLUSTER_DIALECT
Investigate SMB dialect unsupported by current cluster functional level at the first returning call, before a wrapper substitutes a generic message. The SMB request reached a clustered file-server path whose current cluster functional level cannot support the negotiated dialect for that clustered operation.
The contract boundary
These SMB results arise during capability negotiation, before normal file authorization. NEGOTIATE packets and cluster or server capability state are more useful than changing share ACLs.
A server may support a dialect when standalone while the cluster functional level still forbids it for clustered semantics. This differs from no common dialect on an ordinary SMB server. Keep the numeric value, declared return type, and first returning operation together with This result; the same integer can belong to a different status namespace in another API.
Capture before changing state
| Capture | Diagnostic value |
|---|---|
| Client dialect offer, selected dialect, cluster functional level, node OS versions, and file-server role. | Identifies the concrete object and operation associated with SMB dialect unsupported by current cluster functional level. |
| Rolling-upgrade state and whether the connection landed on different cluster nodes. | Separates argument or lifecycle state from a lower-layer provider failure. |
| SMB server configuration per node and witness/CSV or continuously available share context. | Creates a stable before-and-after comparison. |
| Negotiate trace plus cluster events at the first failing node. | Shows whether this condition is the first result or a translated summary. |
For This result preserve client dialect offer, selected dialect, cluster functional level, node OS versions, and file-server role before reinstalling, rebooting, clearing state, or substituting another device or provider. A success observed only after such a change is useful comparison data for It but it does not identify the original cause.
Focused experiments
- Connect to each node or role endpoint with the same client dialect policy. Keep unrelated inputs fixed so the changed result remains attributable to the tested variable.
- Complete a supported cluster functional-level query without changing SMB settings. Record the first returned status and any state transition observed.
- Test the documented older compatible dialect only as a comparison, not as the final fix. Treat a changed result as a new boundary rather than automatic resolution.
Adjacent outcomes
| Observed comparison | Next conclusion to test |
|---|---|
| The first control changes the result | Concentrate on the variable isolated by this check: Connect to each node or role endpoint with the same client dialect policy. |
| The second comparison reproduces the same first status | Preserve lower-layer provider, driver, service, or runtime evidence before editing application data. The second controlled check was: Complete a supported cluster functional-level query without changing SMB settings. |
| A different status appears after the bounded change | The operation moved to another boundary after the third controlled check. That check was: Test the documented older compatible dialect only as a comparison, not as the final fix. Retain both results and interpret the replacement through its own API contract. |
A defensible resolution
Targeted correction. Finish the supported rolling upgrade and raise cluster functional level when all nodes qualify, or use a dialect supported by the current cluster design until then. For This result modify only the object, argument, policy, provider, or lifecycle state identified by the collected evidence.
Acceptance criterion. Every node accepts the intended dialect, continuously available handles survive failover, and the cluster reports a consistent functional level. Re-run the original operation that produced This result under its original identity and supported configuration, then keep one negative control that still produces the expected neighboring outcome.
Technical references
References for This result on the deployed platform version.
- Microsoft Open Specifications: HRESULT values — defines the status namespace used.
- Microsoft: HRESULT facility extraction — documents the API or lifecycle boundary behind this condition.
- Microsoft: cluster OS rolling upgrade — provides ABI, implementation, or protocol context.
- Microsoft Open Specifications: SMB2 — supports the portability and verification limits.
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