What does Windows error code 8531 (ERROR_DS_CANT_START) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Active Directory Domain Services could not start.

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ERROR_DS_SAM_NEED_BOOTKEY_FLOPPY	ERROR_DS_INIT_FAILURE

ERROR_DS_CANT_START

ERROR_DS_CANT_START (8531) is an Active Directory Domain Services error. The Directory Service could not start. This is a domain-controller health event, not an ordinary LDAP request failure. The next step is to preserve the first startup and Directory Service event evidence before attempting repair actions.

What to check

Review the Directory Service, System, DFS Replication, and File Replication Service logs from the startup attempt.
Verify storage availability and the state of the system volume and Active Directory database volumes.
Once AD DS is online, run DCDiag and replication checks before making topology or metadata changes.

Useful command

dcdiag /v /c /e

Microsoft: DCDiag · Microsoft: Clean up AD DS server metadata · Microsoft: Directory Service system error codes

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