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# WinInet Error Codes

The Microsoft Win32 Internet (WinInet) API provides stand-alone applications with easy access to standard Internet protocols such as FTP and HTTP.

The following is a list of error codes returned by the Microsoft Win32 Internet (WinInet) API functions. For more information, see the current MSDN documentation.

Code | Error Message/Description
12001 | ERROR_INTERNET_OUT_OF_HANDLES No more handles could be generated at this time.
12002 | ERROR_INTERNET_TIMEOUT The request has timed out.
12003 | ERROR_INTERNET_EXTENDED_ERROR An extended error was returned from the server. This is typically a string or buffer containing a verbose error message. Call InternetGetLastResponseInfo to retrieve the error text.
12004 | ERROR_INTERNET_INTERNAL_ERROR An internal error has occurred.
12005 | ERROR_INTERNET_INVALID_URL The URL is invalid.
12006 | ERROR_INTERNET_UNRECOGNIZED_SCHEME The URL scheme could not be recognized or is not supported.
12007 | ERROR_INTERNET_NAME_NOT_RESOLVED The server name could not be resolved.
12008 | ERROR_INTERNET_PROTOCOL_NOT_FOUND The requested protocol could not be located.
12009 | ERROR_INTERNET_INVALID_OPTION A request to InternetQueryOption or InternetSetOption specified an invalid option value.
12010 | ERROR_INTERNET_BAD_OPTION_LENGTH The length of an option supplied to InternetQueryOption or InternetSetOption is incorrect for the type of option specified.
12011 | ERROR_INTERNET_OPTION_NOT_SETTABLE The request option cannot be set, only queried.
12012 | ERROR_INTERNET_SHUTDOWN The Win32 Internet function support is being shut down or unloaded.
12013 | ERROR_INTERNET_INCORRECT_USER_NAME The request to connect and log on to an FTP server could not be completed because the supplied user name is incorrect.
12014 | ERROR_INTERNET_INCORRECT_PASSWORD The request to connect and log on to an FTP server could not be completed because the supplied password is incorrect.
12015 | ERROR_INTERNET_LOGIN_FAILURE The request to connect to and log on to an FTP server failed.
12016 | ERROR_INTERNET_INVALID_OPERATION The requested operation is invalid.
12017 | ERROR_INTERNET_OPERATION_CANCELLED The operation was canceled, usually because the handle on which the request was operating was closed before the operation completed.
12018 | ERROR_INTERNET_INCORRECT_HANDLE_TYPE The type of handle supplied is incorrect for this operation.
12019 | ERROR_INTERNET_INCORRECT_HANDLE_STATE The requested operation cannot be carried out because the handle supplied is not in the correct state.
12020 | ERROR_INTERNET_NOT_PROXY_REQUEST The request cannot be made via a proxy.
12021 | ERROR_INTERNET_REGISTRY_VALUE_NOT_FOUND A required registry value could not be located.
12022 | ERROR_INTERNET_BAD_REGISTRY_PARAMETER A required registry value was located but is an incorrect type or has an invalid value.
12023 | ERROR_INTERNET_NO_DIRECT_ACCESS Direct network access cannot be made at this time.
12024 | ERROR_INTERNET_NO_CONTEXT An asynchronous request could not be made because a zero context value was supplied.
12025 | ERROR_INTERNET_NO_CALLBACK An asynchronous request could not be made because a callback function has not been set.
12026 | ERROR_INTERNET_REQUEST_PENDING The required operation could not be completed because one or more requests are pending.
12027 | ERROR_INTERNET_INCORRECT_FORMAT The format of the request is invalid.
12028 | ERROR_INTERNET_ITEM_NOT_FOUND The requested item could not be located.
12029 | ERROR_INTERNET_CANNOT_CONNECT The attempt to connect to the server failed.
12030 | ERROR_INTERNET_CONNECTION_ABORTED The connection with the server has been terminated.
12031 | ERROR_INTERNET_CONNECTION_RESET The connection with the server has been reset.
12032 | ERROR_INTERNET_FORCE_RETRY Calls for the Win32 Internet function to redo the request.
12033 | ERROR_INTERNET_INVALID_PROXY_REQUEST
12036 | ERROR_INTERNET_HANDLE_EXISTS The request failed because the handle already exists.
12037 | ERROR_INTERNET_SEC_CERT_DATE_INVALID
12038 | ERROR_INTERNET_SEC_CERT_CN_INVALID
12039 | ERROR_INTERNET_HTTP_TO_HTTPS_ON_REDIR
12040 | ERROR_INTERNET_HTTPS_TO_HTTP_ON_REDIR
12041 | ERROR_INTERNET_MIXED_SECURITY Indicates that the content is not entirely secure. Some of the content being viewed may have come from unsecured servers.
12042 | ERROR_INTERNET_CHG_POST_IS_NON_SECURE
12043 | ERROR_INTERNET_POST_IS_NON_SECURE
12110 | ERROR_FTP_TRANSFER_IN_PROGRESS The requested operation cannot be made on the FTP session handle because an operation is already in progress.
12111 | ERROR_FTP_DROPPED The FTP operation was not completed because the session was aborted.
12150 | ERROR_HTTP_HEADER_NOT_FOUND The requested header could not be located.
12151 | ERROR_HTTP_DOWNLEVEL_SERVER The server did not return any headers.
12152 | ERROR_HTTP_INVALID_SERVER_RESPONSE The server response could not be parsed.
12153 | ERROR_HTTP_INVALID_HEADER The supplied header is invalid.
12154 | ERROR_HTTP_INVALID_QUERY_REQUEST The request made to HttpQueryInfo is invalid.
12155 | ERROR_HTTP_HEADER_ALREADY_EXISTS The header could not be added because it already exists.
12156 | ERROR_HTTP_REDIRECT_FAILED

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