Error Messages

The error values listed below are returned by GetLastError when one of the Microsoft Windows HTTP Services (WinHTTP) functions fails, and are also returned in the lower 16 bits of HRESULT error returns from the WinHttpRequest object.

Error values whose names begin with "ERROR_WINHTTP_" are specific to the WinHTTP functions. The WinHTTP functions also return Windows error messages where appropriate.

ERROR_WINHTTP_AUTO_PROXY_SERVICE_ERROR

12178

Returned by WinHttpGetProxyForUrl when a proxy for the specified URL cannot be located.

ERROR_WINHTTP_AUTODETECTION_FAILED

12180

Returned by WinHttpDetectAutoProxyConfigUrl if WinHTTP was unable to discover the URL of the Proxy Auto-Configuration (PAC) file.

ERROR_WINHTTP_BAD_AUTO_PROXY_SCRIPT

12166

An error occurred executing the script code in the Proxy Auto-Configuration (PAC) file.

ERROR_WINHTTP_CANNOT_CALL_AFTER_OPEN

12103

Returned by the HttpRequest object if a specified option cannot be requested after the Open method has been called.

ERROR_WINHTTP_CANNOT_CALL_AFTER_SEND

12102

Returned by the HttpRequest object if a requested operation cannot be performed after calling the Send method.

ERROR_WINHTTP_CANNOT_CALL_BEFORE_OPEN

12100

Returned by the HttpRequest object if a requested operation cannot be performed before calling the Open method.

ERROR_WINHTTP_CANNOT_CALL_BEFORE_SEND

12101

Returned by the HttpRequest object if a requested operation cannot be performed before calling the Send method.

ERROR_WINHTTP_CANNOT_CONNECT

12029

Returned if connection to the server failed.

ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED

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.

ERROR_WINHTTP_CLIENT_CERT_NO_ACCESS_PRIVATE_KEY

The application does not have the required privileges to access the private key associated with the client certificate.

Windows Server 2003 with SP1 and Windows XP with SP2: This error is not supported.

ERROR_WINHTTP_CLIENT_CERT_NO_PRIVATE_KEY

The context for the SSL client certificate does not have a private key associated with it. The client certificate may have been imported to the computer without the private key.

Windows Server 2003 with SP1 and Windows XP with SP2: This error is not supported.

ERROR_WINHTTP_CHUNKED_ENCODING_HEADER_SIZE_OVERFLOW

12183

Returned by WinHttpReceiveResponse when an overflow condition is encountered in the course of parsing chunked encoding.

ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED

12044

Returned by WinHttpReceiveResponse when the server requests client authentication.

Windows Server 2003 with SP1 and Windows XP with SP2: This error is not supported.

ERROR_WINHTTP_CONNECTION_ERROR

12030

The connection with the server has been reset or terminated, or an incompatible SSL protocol was encountered. For example, WinHTTP version 5.1 does not support SSL2 unless the client specifically enables it.

ERROR_WINHTTP_HEADER_ALREADY_EXISTS

12155

Obsolete; no longer used.

ERROR_WINHTTP_HEADER_COUNT_EXCEEDED

12181

Returned by WinHttpReceiveResponse when a larger number of headers were present in a response than WinHTTP could receive.

ERROR_WINHTTP_HEADER_NOT_FOUND

12150

The requested header cannot be located.

ERROR_WINHTTP_HEADER_SIZE_OVERFLOW

12182

Returned by WinHttpReceiveResponse when the size of headers received exceeds the limit for the request handle.

ERROR_WINHTTP_INCORRECT_HANDLE_STATE

12019

The requested operation cannot be carried out because the handle supplied is not in the correct state.

ERROR_WINHTTP_INCORRECT_HANDLE_TYPE

12018

The type of handle supplied is incorrect for this operation.

ERROR_WINHTTP_INTERNAL_ERROR

12004

An internal error has occurred.

ERROR_WINHTTP_INVALID_OPTION

12009

A request to WinHttpQueryOption or WinHttpSetOption specified an invalid option value.

ERROR_WINHTTP_INVALID_QUERY_REQUEST

12154

Obsolete; no longer used.

ERROR_WINHTTP_INVALID_SERVER_RESPONSE

12152

The server response cannot be parsed.

ERROR_WINHTTP_INVALID_URL

12005

The URL is not valid.

ERROR_WINHTTP_LOGIN_FAILURE

12015

The login attempt failed. When this error is encountered, the request handle should be closed with WinHttpCloseHandle. A new request handle must be created before retrying the function that originally produced this error.

ERROR_WINHTTP_NAME_NOT_RESOLVED

12007

The server name cannot be resolved.

ERROR_WINHTTP_NOT_INITIALIZED

12172

Obsolete; no longer used.

ERROR_WINHTTP_OPERATION_CANCELLED

12017

The operation was canceled, usually because the handle on which the request was operating was closed before the operation completed.

ERROR_WINHTTP_OPTION_NOT_SETTABLE

12011

The requested option cannot be set, only queried.

ERROR_WINHTTP_OUT_OF_HANDLES

12001

Obsolete; no longer used.

ERROR_WINHTTP_REDIRECT_FAILED

12156

The redirection failed because either the scheme changed or all attempts made to redirect failed (default is five attempts).

ERROR_WINHTTP_RESEND_REQUEST

12032

The WinHTTP function failed. The desired function can be retried on the same request handle.

ERROR_WINHTTP_RESPONSE_DRAIN_OVERFLOW

12184

Returned when an incoming response exceeds an internal WinHTTP size limit.

ERROR_WINHTTP_SCRIPT_EXECUTION_ERROR

12177

An error was encountered while executing a script.

ERROR_WINHTTP_SECURE_CERT_CN_INVALID

12038

Returned when a certificate CN name does not match the passed value (equivalent to a CERT_E_CN_NO_MATCH error).

ERROR_WINHTTP_SECURE_CERT_DATE_INVALID

12037

Indicates that a required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file, or that the validity periods of the certification chain do not nest correctly (equivalent to a CERT_E_EXPIRED or a CERT_E_VALIDITYPERIODNESTING error).

ERROR_WINHTTP_SECURE_CERT_REV_FAILED

12057

Indicates that revocation cannot be checked because the revocation server was offline (equivalent to CRYPT_E_REVOCATION_OFFLINE).

ERROR_WINHTTP_SECURE_CERT_REVOKED

12170

Indicates that a certificate has been revoked (equivalent to CRYPT_E_REVOKED).

ERROR_WINHTTP_SECURE_CERT_WRONG_USAGE

12179

Indicates that a certificate is not valid for the requested usage (equivalent to CERT_E_WRONG_USAGE).

ERROR_WINHTTP_SECURE_CHANNEL_ERROR

12157

Indicates that an error occurred having to do with a secure channel (equivalent to error codes that begin with "SEC_E_" and "SEC_I_" listed in the "winerror.h" header file).

ERROR_WINHTTP_SECURE_FAILURE

12175

One or more errors were found in the Secure Sockets Layer (SSL) certificate sent by the server. To determine what type of error was encountered, check for a WINHTTP_CALLBACK_STATUS_SECURE_FAILURE notification in a status callback function. For more information, see WINHTTP_STATUS_CALLBACK.

ERROR_WINHTTP_SECURE_INVALID_CA

12045

Indicates that a certificate chain was processed, but terminated in a root certificate that is not trusted by the trust provider (equivalent to CERT_E_UNTRUSTEDROOT).

ERROR_WINHTTP_SECURE_INVALID_CERT

12169

Indicates that a certificate is invalid (equivalent to errors such as CERT_E_ROLE, CERT_E_PATHLENCONST, CERT_E_CRITICAL, CERT_E_PURPOSE, CERT_E_ISSUERCHAINING, CERT_E_MALFORMED and CERT_E_CHAINING).

ERROR_WINHTTP_SHUTDOWN

12012

The WinHTTP function support is being shut down or unloaded.

ERROR_WINHTTP_TIMEOUT

12002

The request has timed out.

This error can be returned as a result of TCP/IP time-out behavior, regardless of time-out values set in Windows HTTP Services.

ERROR_WINHTTP_UNABLE_TO_DOWNLOAD_SCRIPT

12167

The PAC file cannot be downloaded. For example, the server referenced by the PAC URL may not have been reachable, or the server returned a 404 NOT FOUND response.

ERROR_WINHTTP_UNHANDLED_SCRIPT_TYPE

12176

The script type is not supported.

ERROR_WINHTTP_UNRECOGNIZED_SCHEME

12006

The URL specified a scheme other than "http:" or "https:".

ERROR_NOT_ENOUGH_MEMORY

Not enough memory was available to complete the requested operation.

Header: Declared in Winerror.h

ERROR_INSUFFICIENT_BUFFER

The size, in bytes, of the buffer supplied to a function was insufficient to contain the returned data. For more information, see the specific function.

Header: Declared in Winerror.h

ERROR_INVALID_HANDLE

The handle passed to the application programming interface (API) has been either invalidated or closed.

Header: Declared in Winerror.h

ERROR_NO_MORE_FILES

No more files have been found.

Header: Declared in Winerror.h

ERROR_NO_MORE_ITEMS

No more items have been found.

Header: Declared in Winerror.h

ERROR_NOT_SUPPORTED

The required protocol stack is not loaded and the application cannot start WinSock.

Header: Declared in Winerror.h

Remarks

For Windows XP and Windows 2000, see the Run-Time Requirements section of the WinHttp start page.

Requirements

Minimum supported client
Windows XP, Windows 2000 Professional with SP3 [desktop apps only]
Minimum supported server
Windows Server 2003, Windows 2000 Server with SP3 [desktop apps only]
Redistributable
WinHTTP 5.0 and Internet Explorer 5.01 or later on Windows XP and Windows 2000.
Header
Winhttp.h

See also

WinHTTP Versions