I have a small home network with computers having different versions of Windows. I have XP Pro, Vista Business, XP home, and 2003 Server. I can log on to Windows 2003 and copy to and from Vista, XP Pro, and XP Home. I can log on to XP Pro and copy files to and from Vista, 2003, and XP Home. I can log on to XP Home and copy files to and from 2003, Vista, and XP Pro. I log on to Vista and can copy files to and from XP Pro and XP Home. When logged into Vista, I can copy files from 2003 but no to 2003 (unless they are less that 15kb in size). From Vista I can rename and delete files on 2003. Since I am able to copy tiny files to 2003 and any file from 2003 I don't think that this is a permissions problem. I had a similar problem with XP Pro until I disabled IEEE 802.1x authentication on my NIC in the 2003 machine. It seems to be an issue on the Vista side. I've been struggling with this for weeks. Any help/suggestions is greatly appreciated.

One other note, the error I get when trying to copy from Vista to 2003 is "Invalid File Handle". Don't know if this helps or not.