I've just had this problem as well and here's what I did:

In smb.conf add the following in the [global] section:

client signing = no
client use spnego = no


I'm backing up an old Windows 2000 box, and without turning off client signing 
and spnego I was getting errors on any file or directory that was longer than 
8.3 (or so it seemed).

I'm running Samba 3.0.28a on Gentoo..

[/code]

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