I recently migrated from IIS 4.0 to IIS 5.0 and everything seems to work except for FTP. I have multiple virtual directories in my IIS 5.0 and each points to a different remote folder on an NT 4.0 file server. The problem lies in that when I try to access my data via a FTP client it requires I put in an NT domain name. I would rather not give that information out. Can anybody offer some advice.

Create local user accounts on the server where the shares reside, with the required access to the ftp-directories (ntfs file permissions), don't make these user accounts members of any group and use those accounts for the ftp access. That way you don't generate any logon traffic on the network and your files will be secure (provided you applied all security fix patches from Microsoft).