bug on submitting multipart/form-data form

[ivand]

i got an error page in IE or message "The document contains no data" in Firefox when submitting form with enctype="multipart/form-data" - tested on several sites.
i investigated that problem appears only when Extended Network Driver is enabled. Problem disappears (form submitting performs fine) when i uncheck that checkbox in settings.

i have wingate 6.0.4 build 1025 with default settings;
sample html code which provokes the error:
<form action="" method="post" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="307200" />
<input type="file" name="img1" id="img1" size="35" class="uploadform" /><br>
<input type=submit>
</form>
this code is uploaded to http://nd.net.ru/test/

[Pascal]

How do your clients connect out through WinGate? I tried this on an intercepted NAT connection and that worked fine with Firefox.

[ivand]

i experience this error on server computer (basically, i use Wingate to share an internet connection from desktop to laptop).
i have win2k sp3 and dialup connection there.