Login problem to a SUN server

[Rodriguez, Carlos (CORP, DDEMESIS)]

Hi

I have SAMBA on a SUN server with Solaris 7 and my client is a Windows NT 4. By now I can see the Sun01 server in the Network Neighborhood but when I try to get in the Sun sever,
it ask me for password because the password or user is incorrect. After that I type my user and password for the Sun server and I get a new message

\\SUN server is not accessible
The account is not authorized to login from this station

Thanks for your help