Are you using https: ? There is a known issue with IE6, https: and caching in 0.19.2. (I can't find the number because of a server problem). I believe that it is fixed in the current version.

NO. I think there is problem with IIS 6.0 which comes with windows 2003 server which is prohibiting the download of documents. Even we have tried to debug the code by commenting line by line and found that the following code segment is not executed properly by IIS 6.0. I think there is the problem that IIs 6.0 is not able to send proper header information to client browser. Please resolve this issue as soon as possible as we are stuck with this problem for which we are not able to use this product. There is one doubt in my mind that whether mantis is supported on Windows 2003 server using IIS 6.0?

code segment

header( 'Pragma: public' );

header( 'Content-type: ' . $v_file_type );
header( 'Content-Length: ' . $v_filesize );

# Added Quotes (") around file name.
header( 'Content-Disposition: filename="' . file_get_display_name( $v_filename ) . '"' );
header( 'Content-Description: Download Data' );
# prevent file caching @@@ (thraxisp) we may want to suppress this for small files
header( 'Pragma: no-cache' );
header( 'Expires: 0' );

The problem I was referring to is described here http://support.microsoft.com/default.aspx?scid=kb;en-us;316431 .

Does removing the last two lines help?
header( 'Pragma: no-cache' );
header( 'Expires: 0' );

Are you seeing a specific error message or is the file not being downloaded?

I don't have access to a Windows 2003 Server installation to debug this.

Thanks for your solution. it worked

Fix submitted to CVS to allow file cacheing through the $g_allow_file_cache variable.

bug_report_advanced_page.php -> 1.49
bug_report_page.php -> 1.52
config_defaults_inc.php -> 1.264
core.php -> 1.42
file_download.php -> 1.36
meta_inc.php -> 1.18