Webfolders and authentication required for every file download

Hi all,

I run Netstorage on an OES/Netware (Netware 6.5 SP6) and our users use
Windows' XP Webfolder feature to access the files on a clustered volume.

They log in successfully and can navigate through all drives and folders.
Whenever they try to open a file, they need to re-authenticatte to
eDirectory in order to open the file.

Any idea what goes wrong ?

Many thaks for your help,
Romain Petges