Dear Bach
may be i'm replying on an old thread, but i want to share my experience.
similar to your problem i got two servers A & B where i can access the Shared folder \\B\Share from Server A with specific windows account
on Server A you need to host a web application with the IZWebFileManager Control availing the shared folder on Server B to web users
if like me you got a lot of hard time configuring the shared folder as a UNC path in the control witch fails,
the workaround of virtual folder in IIS also failed because of authentication problems
My solution was to add a soft symbolic link of the shared folder in the web application folder. then configure the control to access the sub folder normally
Example:
1. Login to Server A
2. Open an elevated CMD (i.e. as administrator)
3. CD to the web application folder
4. type:
mklink /D Share \\B\Share
where
/D Creates a directory symbolic link. Default is a file symbolic link.
Share is the folder to configure in the file manager control
\\B\Share is the full UNC path to the shared folder
Note: you'll still have to grant access to the application pool identity to access the shared folder.