Most often this is seen when the netbios name and workgoup parameters in your smb.conf have the same parameters. Use different names for the server netbios name and workgroup name (possibly even need unique user names). "The Microsoft World (tm) has a flat namespace, and an even flatter one in NetBIOS Land. In NetBIOS, users, servers, workgroups and more all exist in the same namespace.
Whoever registers the NetBIOS name first, be it the computer or the workgroup, the other will be unable to do so."

Also consider: encrypt passwords = yes (a wild additional guess)
JLK



>I have described below statements in smb.conf:
>
>[global]
> Workgroup = Heaven
> domain logons = yes
> security = user
> os level = 34
> local master = yes
> preferred master = yes
> domain master = yes
>
>[netlogon]
> path = /usr/local/share/logon
> public = no
> writable = no
> browsable = no
>
>and my Windows 98 client is also configured correctly, but I still can not logon to RedHat 7.2 .. does the above statements have something wrong or missing?.. ("Incorrect Parameter" message is occurs when trying to logon by using Windows 98 client and the domain is already configured as Heaven)
>
>thanks for any idea and or suggestion
>
>regards
>
>Winan