>>>If you are using the windows api for ftp, don't install IE11., Stick with IE10
>>>
>>>After reinstall of IE10 - everything returned to normal
>>>
>>>http://stackoverflow.com/questions/19683291/wininet-from-ie-11-randomly-returns-error-12003-for-most-ftp-functions
>>
>>IE 11 also by default doesn't work with SBS 2011 RWA. To make that work you have to add the SBS site as a trusted site, then manually add the URL to the compatibility list.
>>
>>I wonder whether doing the same thing for the FTP site would make any difference ...
>
>Everyone can make a mistake, but I would expect microsoft to do some testing before they release

There are a few ways you can work around this problem. You can bypass FtpOpenFile() by using FtpPutFile() which works.

More info and a few other workarounds mentioned here (in relation to wwFtp which uses WinInet):
http://west-wind.com/wconnect/weblog/ShowEntry.blog?id=898

+++ Rick ---