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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