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ERROR_NO_WRITABLE_DC_FOUND
Could not find a writable domain controller in the domain.
ERROR_NO_WRITABLE_DC_FOUND is Win32 error 8621 (0x000021AD) in Active Directory Domain Services.
Likely impact: Read-only operations may continue while password, join, and directory-write workflows fail.
Typical causes
- only read-only DCs are reachable.
- writable DC locator records are missing.
- site, firewall, or routing prevents access.
- all writable DCs are offline or unhealthy.
Troubleshooting steps
- Verify that at least one reachable writable DC satisfies the requested domain, site, and capability flags.
- Collect DsGetDcName flags and result and DNS SRV records.
Useful evidence
- Collect DC role and health.
- Collect LDAP, Kerberos, SMB, and RPC reachability.
Recovery and retry
Restore a writable DC or correct locator, DNS, site, and network configuration, then rediscover rather than pinning an RODC.
Related errors
ERROR_DOMAIN_CONTROLLER_NOT_FOUND can mean no matching DC; this code specifically requires a writable one
Example
A branch can contact its RODC but a password reset needs a writable DC. Restoring the WAN path to a hub DC makes locator return an eligible server.
References
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