[ale] Samba logins

[Jeffery TIllotosn]

I have just upgraded my LINUX box to Red Hat 5.0.  The kernal is 2.0.32 and
I am running Samba 1.9.17p4 my problem is probably from sheer inexperience
but it has me rather stumped.  When I try to use a directory on the LINUX
box from my NT 4.0 box it gives me an error that says the account is not
authorized to login from this station.  The account names and passwords are
right.  Can someone give me some ideas?  
Prior to the upgrade this was working fine.