Impossible to connect to UNC RootFolder

Hi,
i'm trying your software and i think it's fantastic.
But i have a problem! 
I have the IIS server and FileVista installed on a Windows 2003 SBS server but the folders i have to share are on another server.
I try to configure the RootFolders using the UNC link to the existing share folders on other server. But when i login as a configured user in FileVista web page i receive the error that is impossible to find the folder on disk! But the folder exists and it's configured with all the right account's permission (i think so).
Can you hel me, please?
Thank you very much and sorry for my bad english

i resolved my problem!!

I use \\server/folder and now it's everything ok