What does Windows error code 8225 (ERROR_DS_PROTOCOL_ERROR) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: ERROR_DS_PROTOCOL_ERROR a protocol error occurred.

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ERROR_DS_OPERATIONS_ERROR	ERROR_DS_TIMELIMIT_EXCEEDED

ERROR_DS_PROTOCOL_ERROR

ERROR_DS_PROTOCOL_ERROR (0x00002021) is an Active Directory Domain Services LDAP result. The LDAP server rejected the request because it did not conform to the LDAP protocol expected by the server.

What to check

Check the client library, requested operation, control encoding, and LDAP protocol version.
Capture the client-side request or ETW trace to identify the malformed PDU or unsupported sequence.
Test the same operation with a supported LDAP client to separate client construction from server configuration.

Useful command

netsh trace start scenario=InternetClient capture=yes

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

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