What does Windows error code 8426 (ERROR_DS_BUILD_HIERARCHY_TABLE_FAILED) mean?

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ERROR_DS_BAD_HIERARCHY_FILE	ERROR_DS_CONFIG_PARAM_MISSING

ERROR_DS_BUILD_HIERARCHY_TABLE_FAILED

The attempt to build the hierarchy table failed.

The native value for ERROR_DS_BUILD_HIERARCHY_TABLE_FAILED is 8426 (0x000020EA). Preserve this result immediately after the failing Windows call because later logging, cleanup, LDAP, RPC, or file operations can replace the last-error value.

This result belongs to Active Directory Domain Services (AD DS). A diagnosis of it must connect the condition to the producing API, current state, object identity, and first lower-level diagnostic.

Where the result appears

• processing building an in-memory directory or address-book hierarchy table.
• executing an LDAP, RPC, deployment, replication, or directory-management operation.
• working against a specific domain controller whose replica and schema state affect the result.
• translating extended directory diagnostics into a Win32 error for an application or administration tool.

State boundary to prove

This result applies to building an in-memory directory or address-book hierarchy table and does not by itself prove that the entire server, directory, disk, session, or application is unavailable. The state boundary to prove for it is whether all hierarchy inputs can be resolved into a complete acyclic table within available resources. Use input object count and nesting depth, first object or parent that fails, and memory and resource state as independent evidence. When evidence for it disagrees, preserve timestamps and investigate the transition instead of selecting the most convenient value.

Likely causes

• input hierarchy data is inconsistent.
• a parent reference is missing or cyclic.
• memory allocation or index construction failed.
• the hierarchy exceeds implementation limits.

Diagnostic sequence

1. capture error 8426 immediately at the API boundary and record the operation that was attempted.
2. identify the exact owner of building an in-memory directory or address-book hierarchy table, including object generation, server, path, session, replica, or client context.
3. collect input object count and nesting depth before restarting a service or changing configuration.
4. compare first object or parent that fails with the documented or observed precondition.
5. correlate memory and resource state with the Directory Service event log, LDAP extended diagnostics, replication metadata, dcdiag and repadmin output, and the calling application’s request trace.
6. determine whether side effects occurred and verify recovery after changing one responsible condition.

Evidence to collect

• input object count and nesting depth.
• first object or parent that fails.
• memory and resource state.
• preceding hierarchy or address-book events.

Correlate it with the Directory Service event log, LDAP extended diagnostics, replication metadata, dcdiag and repadmin output, and the calling application’s request trace. Keep the first detailed status even when a later wrapper translates it to error 8426; the first status often distinguishes transport, authorization, storage, schema, state, and application-integrity causes that share the same final Win32 result.

Handling, retry, and recovery

The recovery objective is to validate hierarchy relationships, reduce unsupported depth, correct missing parents, and rebuild from authoritative data.

Retry it only after the recorded condition changes and completion state is known. Idempotent queries may be repeated after recovery, but mutations require a state check first; backoff cannot repair malformed input, corruption, missing structure, or policy rejection.

Telemetry and support fields

• record ds_build_hierarchy_table_failed_api for the producing function or management operation.
• record ds_build_hierarchy_table_failed_target for the file, log, session, replica, object, or server identity.
• record ds_build_hierarchy_table_failed_state_before and ds_build_hierarchy_table_failed_requested_transition.
• record ds_build_hierarchy_table_failed_first_status for the earliest lower-level diagnostic.

For support escalation involving it, retain decimal 8426, hexadecimal 0x000020EA, the API, UTC time, target identity, and first subsystem-specific status. Include the smallest reproducible request and evidence that distinguishes this condition from nearby codes. In the context of it, many ds codes are internal or management-facing and are not tied to one public function. the producing ldap, rpc, deployment, or management api must therefore be recorded with the code.

Difference from nearby results

ERROR_DS_BAD_HIERARCHY_FILE identifies an invalid file before table construction; this code reports failure during construction

Practical validation scenario

An address-book hierarchy contains a cycle introduced by a bad import. Detecting and removing the cyclic parent reference lets the table build successfully. The negative test should preserve the responsible condition and reproduce it; the recovery test should change only the identified cause, repeat the same operation, and verify both success and the absence of an unintended partial side effect.

Developer and administrator guidance

Administrators handling it should preserve Directory Service events, replication metadata, and the contacted domain controller before changing objects or forcing role transitions. Developers should retain LDAP extended diagnostics and object identities across wrappers so the Win32 code does not erase the actionable directory result. Code that exposes it through RPC, JSON, REST, PowerShell, or another protocol should preserve the Win32 domain, decimal 8426, hexadecimal 0x000020EA, and original component diagnostic.

References

• Microsoft: Win32 system error range containing this code — official context relevant to it.
• Microsoft: AD DS troubleshooting — official context relevant to it.
• Microsoft: repadmin — official context relevant to it.
• Microsoft: dcdiag — official context relevant to it.
• Microsoft: AD and LDS diagnostic event logging — official context relevant to it.

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