What does Windows error code 8207 (ERROR_DS_UNAVAILABLE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: ERROR_DS_UNAVAILABLE means the directory service required for the request is unavailable.

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ERROR_DS_BUSY	ERROR_DS_NO_RIDS_ALLOCATED

ERROR_DS_UNAVAILABLE

ERROR_DS_UNAVAILABLE (0x0000200F) is an Active Directory Domain Services LDAP result. The directory service could not process the LDAP request because the required directory service was unavailable.

Check Directory Service events, replication state, database health, and dependent services on the contacted domain controller. If another DC succeeds, preserve the failing server identity so the outage is not masked by client failover.

What to check

Confirm the target domain controller is reachable and the AD DS service is running.
Determine whether the failure affects one DC, one site, or the entire domain.
Check Directory Service and System events for startup, replication, DNS, or resource failures that preceded the request.

Useful command

Test-NetConnection "<dc-fqdn>" -Port 389

Microsoft: AD DS diagnostic logging · Microsoft: LDAP ETW tracing · Microsoft: AD DS LDAP operations

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