Error Code Portal
MicrosoftWindows WinHTTPError code

12044

ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED

Alternative forms: 0x00002F0C · 0x2F0C · ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED

What does this code mean?

Code 12044 · An issue reported by Windows WinHTTP.

Official explanation · Original text

Returned by WinHttpReceiveResponse when the server requests client authentication. Windows Server 2003 with SP1 and Windows XP with SP2: This error is not supported. The server requires SSL client Authentication. The application retrieves the list of certificate issuers by calling WinHttpQueryOption with the WINHTTP_OPTION_CLIENT_CERT_ISSUER_LIST option. For more information, see the WINHTTP_OPTION_CLIENT_CERT_ISSUER_LIST option. If the server requests the client certificate, but does not require it, the application can alternately call WinHttpSetOption with the WINHTTP_OPTION_CLIENT_CERT_CONTEXT option. In this case, the application specifies the WINHTTP_NO_CLIENT_CERT_CONTEXT macro in the *lpBuffer* parameter of WinHttpSetOption. For more information, see the WINHTTP_OPTION_CLIENT_CERT_CONTEXT option. Windows Server 2003 with SP1 and Windows XP with SP2: This error is not supported.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

Error Messages (Winhttp.h) ↗

Creator: Microsoft and MicrosoftDocs contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted numeric codes, symbolic names and English message text; converted Markdown/HTML to plain text and normalized whitespace; added Korean product context, namespace labels, status classification and separately labeled official links. No machine translation of message text.

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