What does Windows error code 8234 (ERROR_DS_AUTH_UNKNOWN) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The directory service did not recognize the authentication mechanism requested by the LDAP client.

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ERROR_DS_INAPPROPRIATE_AUTH	ERROR_DS_REFERRAL

ERROR_DS_AUTH_UNKNOWN

ERROR_DS_AUTH_UNKNOWN (0x0000202A) is an Active Directory Domain Services LDAP result. The directory service did not recognize the authentication mechanism requested by the LDAP client.

Compare the requested SASL or authentication mechanism with server capabilities and client library configuration. If a wrapper selected the mechanism automatically, capture that negotiated choice instead of assuming credentials themselves are wrong.

What to check

Verify the client SASL mechanism and the libraries available on the client and server.
Confirm that an intermediary is not altering the bind request or redirecting it to a different LDAP implementation.
Use a supported Kerberos, NTLM, or LDAPS path according to the directory policy.

Useful command

Get-ADRootDSE -Server "<dc-fqdn>"

Microsoft: AD DS LDAP operations · Microsoft: LDAP signing · Microsoft: LDAP ETW tracing

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