samba - Sep 2004 - Can't become connected user! - network browsing issue

Hi,

I am having an issue browsing my work group, i have made the samba 
server the master browser and it wins the elections. As far as i can 
tell from the nmbd.logs it is also collecting hosts for the workgroup 
but when you try to list the workgroup this error is recorded in the 
messages log :

nss_wins[7417]: [2004/09/14 09:54:23, 0] 
smbd/service.c:make_connection_snum(570)

nss_wins[7417]:   Can't become connected user!

Now all users can use \\server and list the shares and access them all, 
so all users and passwords are correct.

windows gives the error "Workgroup is not accessible, you might not have 
permission to use the network resource"

The server is running Fedora Core 1 and samba version : 3.0.6-2.FC1

The best bits of my smb.conf is below, thanks for any help.

Carl Matthews

# Samba config file created using SWAT
# from 0.0.0.0 (0.0.0.0)
# Date: 2004/06/23 10:15:40

# Global parameters
[global]
     log file = /var/log/samba/%m.log
     loglevel = 1
     load printers = No
     security = user
     encrypt passwords = yes
     guest ok = yes
     dos filemode = Yes
     ldap ssl = no
     name resolve order = wins lmhosts host bcas
     socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
     deadtime = 15
     create mask = 0775
     encrypt passwords = yes
     oplock break wait time = 100
     wins support = Yes
     dns proxy = No
     netbios aliases = FC1
     server string = -Server- FC1
     #unix password sync = yes
     local master = yes
     mangle prefix = 8
     os level = 255
     directory mask = 0775
     valid users = @MLE-ALL
     preferred master = yes
     max log size = 500

[www]
     comment = Mandrake Webserver
         path = /var/www
         valid users = carl
         admin users = carl
         read list = carl
         write list = carl
         read only = No


[homes]
     comment = Home Directories
     path = /home/%u
     read only = No

[printers]
     comment = All Printers
     path = /var/spool/samba
     printable = Yes
     browseable = No

[NET-Eng]
     comment = Product Design By Genius
     path = /mnt/mle-net/MLE-NET/MLE-NET-Eng
     write list = @MLE-ALL
     force user = mleall
     read only = No