PRB: FTP WinInet APIs Report Error 12003
Article ID: 168492
Article Last Modified on 8/28/1999
APPLIES TO
- Microsoft Internet Explorer 3.0
- Microsoft Internet Explorer 3.01
- Microsoft Internet Explorer 3.02
- Microsoft Internet Explorer 4.0 128-Bit Edition
- Microsoft Internet Explorer 4.01 Service Pack 2
This article was previously published under Q168492
SYMPTOMS
Connection to a non-Microsoft FTP server with WinInet FTP APIs may fail
with error 12003.
CAUSE
When connecting to a non-Microsoft FTP server with WinInet APIs, some
WinInet FTP APIs may fail with error 12003 (ERROR_INTERNET_EXTENDED_ERROR).
The InternetGetLastResponseInfo API may not retrieve any Internet specific
information. This error may occur when the FTP server sends an unexpected
status code to the WinInet client. Please note that this may not indicate
an error, but rather the server's success message or confirmation (such as
confirmation of getting a file, sending a directory listing, and so forth).
In some cases the WinInet FTP APIs may not parse such messages correctly
and erroneously report an error. This may happen when the WinInet FTP APIs
are used to connect to certain VAX/VMS FTP servers.
RESOLUTION
The above behavior may be avoided by not using the INTERNET_FLAG_PASSIVE
flag in the InternetConnect or InternetOpenUrl API. When this flag is not
used WinInet uses active semantics for the FTP connection, which avoids the
return of the status code, which causes the parsing problem.
REFERENCES
See FTP Protocol Specification (RFC 959) for more information.
Keywords: kberrmsg kbprb KB168492