SAMBA client and NT server:PROBLEMS!!

[demartino vittorio grtn it]

At work I have an NT workstation connected to a powerful network of Win NT 4
servers. As usual, while connecting, I give a userid and password. I can see
a remote net logon batch file starting on my WS (it only does a series of
net use ------)  and finally I see the network shares S,U,V,W,Y,Z. 
As a newbye, I installed redhat 6.2 on my portable PC and tried to configure
it as a client the same NT servers of with the following SAMBA
conf file.  
-----------------------My smb.conf file
 
[global]  # Netbios Name for my PC client 
netbios name = e0254228 
    workgroup = TXL
    server string = DEMLNX
    security = user
    password level = 8
    username level = 8
 wins server=10.70.30.3
    encrypt passwords = yes
    smb passwd file = /etc/smbpasswd
    unix password sync = yes
 passwd program=/usr/bin/passwd %u
    null passwords = no
    os level = 0
    preferred master = no
    domain master = no
    wins support = no
    dead time = 0
    debug level = 3
    load printers = no

--------------------------  END
With this file, I'm able to browse the network with smbclient (as in windows
network neighborhood) seeing all the clients and servers connected. 
Starting an smbclient  //svrsrs1/dati myuserid%mypasswd (defined by means of
smbpasswd), which is the share with my data, I can connect to my directory ,
use "get" and "put" successfully but when I try a "cd "command to the
directory "De Martino" (the space is important) I get the following error: 
smbclient  //svrsrs1/dati myuserid%mypasswd 
doing parameter load printers = no 
pm_process() returned Yes 
added interface ip=10.100.202.225 bcast=10.100.203.255 nmask=255.255.252.0 
Client started (version 2.0.7). 
resolve_lmhosts: Attempting lmhosts lookup for name srvscmr1<0x20> 
resolve_hosts: Attempting host lookup for name srvscmr1<0x20> 
Connecting to 10.155.201.37 at port 139 

Domain=[TXLTN_SC] OS=[Windows NT 4.0] Server=[NT LAN Manager 4.0] 
smb: \>cd PE 
dos_clean_name [\PE\] 
dos_clean_name [\PE\\] 
smb: \>cd De Martino
cd \PE\De\:ERRDOS-ERRbadpath (Directory invalid) 


And 
trying to mounting the same share by means of smbmount I get the following
error 
Session setup failed: ERRDOS 
ERRnoaccess (access denied) 

I understand that there's something wrong  with the filename definitions but
I don't know what are the right SAMBA options to see a Windows NT share
correctly. 
Any suggestion to help me? 
Ciao (Bye Bye) 
Vittorio