Second Call to FtpOpenFile() Without Write Permission Hangs

• Microsoft Internet Explorer version 5 for Windows 95
• Microsoft Internet Explorer version 5 for Windows 98
• Microsoft Internet Explorer version 5 for Windows NT 4.0

SYMPTOMS

When a program makes a second FtpOpenFile function call to a file on a File Transfer Protocol (FTP) server, the program may stop responding (hang) if you do not have write permissions to the site.

CAUSE

In this case, a stop command is sent to the server because the file was not completely read. A reply is sent to the client from the server that the stop was successful. However, Wininet.dll does not read the response before the socket is closed. Therefore, when the socket is reopened for writing, the "stop successful" response is still in the buffer. This situation causes the send commands and responses to get out of synchronization. Being out of synchronization causes the client to hang.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Internet Explorer service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

Additional query words:

Keywords : msiew95 msient msiew98
Version : WINDOWS:5
Platform : WINDOWS
Issue type : kbprb