[Samba] smbclient returns error

[root at sviluppo.synchron.it]

Hy,
can anyone help me?
When I try to use "smbclient -L localhost -U<username>", after password entry, 
It is shown: 
Domain=[LINUX] OS=[Unix] Server=[Samba 2.2.5]
tree connect failed: NT_STATUS_BAD_NETWORK_NAME

What can I do?

Thanks.


Francesco