What does Windows error code 8255 (ERROR_DS_PARAM_ERROR) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: One or more LDAP operation parameters are invalid for the request the client sent.

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ERROR_DS_FILTER_UNKNOWN	ERROR_DS_NOT_SUPPORTED

ERROR_DS_PARAM_ERROR

ERROR_DS_PARAM_ERROR (0x0000203F) is an Active Directory Domain Services LDAP result. One or more LDAP operation parameters are invalid for the request the client sent.

What to check

Capture the exact LDAP operation, controls, search scope, base DN, and attribute list.
Validate each parameter against the operation type instead of changing multiple values at once.
Reproduce the request with a minimal supported set of parameters to identify the invalid field.

Useful command

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

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

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