"The account is not authorized to login from this station"

[Marco Schmidt]

This happens if you install service pack 3 or Win95. 
NT4 with SP3 will send encrypted passwords which samba (on default) 
cannot understand. 
If you need high security see the "ENCRYPTION.txt" in the docs 
directory. 
Otherwise you can turn on plain passwords under NT in the registry,
see docs directory (NT4_PlainPassword.reg, Win95_PlainPassword.reg).

I think this error message is to confuse hackers :-)

Marco