What does Windows error code 8233 (ERROR_DS_INAPPROPRIATE_AUTH) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The authentication request is not appropriate for the requested LDAP operation or server state.

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ERROR_DS_STRONG_AUTH_REQUIRED	ERROR_DS_AUTH_UNKNOWN

ERROR_DS_INAPPROPRIATE_AUTH

ERROR_DS_INAPPROPRIATE_AUTH (0x00002029) is an Active Directory Domain Services LDAP result. The authentication request is not appropriate for the requested LDAP operation or server state.

What to check

Check the bind identity, authentication mechanism, target DC, and whether the request uses LDAP or LDAPS.
Verify that the client is not using an anonymous or simple bind where the server requires a different method.
Capture the server diagnostic message because it often identifies the rejected authentication condition.

Useful command

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

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