Have Win SBS 2003, IIS 60, ISA 2004, running ftp server. Can get read access with either anonymous or authenticated access. Cannot get write access either way. I have turned on write access in FTP properties, gave user perms in FTP properties, gave user account perms to folder, ISA is configured for all user inbound and outbound. I can set for authenticated access, get on the server, go through Windows Explorer and connect. I get authentication prompt and can upload files. That seems to indicate it has something to do with ISA.