Error -6602 while connecting to samba shares.

Question

Hi everyone, i have some problems with samba client on MacOSX 10.5.8, the problem is that it connects to some shares and some not, and I don't know why, please help.
Here is my samba configurations on Ubuntu server, the problem starts after logging as a user kuba with password, it shows Erro -6602. Login and pass are correct, I use them with a parallel desktops windows xp, and it works. Mac is working with other server which stands on PLD Linux. I don't know if it will be usefull but if i can tell you that password doesn't contain any special chars, the only one is undescore char. The same password and user with some additional letters works on PLD.
I can connect to samba shares on this server with smbtree command, if I use
smbclient //server/share -U user with a password authentication it shows a wrong password (but it's correct).
When I delete the valid user definition I can connect to samba, but only with a readonly mode...
[global]
netbios name = ubunteon
server string = ubunteon
workgroup = *********
announce as = NT Server
announce version = 4.9
security = share
encrypt passwords = yes
update encrypted = no
unix password sync = no
smb passwd file = /etc/samba/smbpasswd
logon script = startup.bat
logon drive =
add user script = sudo /usr/sbin/useradd -g smbusers %u
delete user script = sudo /usr/sbin/userdel -r %u
add group script = sudo /usr/sbin/groupadd %g
delete group script = sudo /usr/sbin/groupdel %g
add user to group script = sudo /usr/sbin/usermod -G %g %u
add machine script = sudo /usr/sbin/useradd -g smbmachines -c 'Konto komputera %I' -s /bin/false -d /var/lib/samba/nobody %u
passwd chat debug = no
passwd chat = New*UNIX*password %n\n ReType*new*UNIX*password %n\n passwd:*all*authentication*tokens*updatedsuccess fully*
passwd program = /usr/bin/smbpasswd -L -a %u
nt acl support = no
nt pipe support = yes
map to guest = Bad User
log file = /var/log/samba/log.%m
max log size = 50
log level = 1
os level = 255
domain logons = no
preferred master = yes
domain master = yes
local master = yes
time server = yes
browse list = yes
enhanced browsing = yes
idmap uid = 16777216-33554431
idmap gid = 16777216-33554431
winbind enum groups = yes
winbind enum users = yes
winbind use default domain = no
winbind separator = +
unix charset = UTF8
display charset = UTF8
dos charset = CP852
wins support = yes
read raw = yes
write raw = yes
oplocks = no
level2 oplocks = no
max xmit = 65535
getwd cache = yes
dos filetimes = yes
dos filemode = yes
dos filetime resolution = yes
deadtime = 15
default case = lower
preserve case = yes
short preserve case = yes
case sensitive = no
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_SNDBUF=16384 SO_RCVBUF=16384
dns proxy = no
name resolve order = hosts lmhosts wins bcast
guest account = guest
admin users = smbroot
invalid users = root
load printers = yes
printing = cups
printcap name = cups
[www]
comment = Webpages
path = /home/user/public_html
public = no
read only = no
browseable = no
create mask = 0755
directory mask = 0755
valid users = user
browseable = yes
writeable = yes
#printable = yes
[devel]
comment = Development Zone
path = /home/user/0-Developement
public = no
read only = no
browseable = no
create mask = 0755
directory mask = 0755
valid users = user
browseable = yes
writeable = yes
#printable = yes
[pdfprints]
comment = Development Zone
path = /home/user/PDF
public = no
read only = no
browseable = no
create mask = 0755
directory mask = 0755
valid users = user
browseable = yes
writeable = yes
#printable = yes
[home]
comment = Home
path = /home/user
public = no
read only = no
browseable = yes
writeable = yes
valid users = user
[oferty]
comment = Oferty
path = /home/user/public_html/2-Oferty
public = no
read only = no
browseable = yes
writeable = yes
valid users = user
#udostepnienia widziane przez wszystkich
#drukarki
[printers]
comment = Drukarki sieciowe
browseable = no
path = /var/spool/samba
printable = yes
writable = no
create mode = 0700
#drivery do drukarek sieciowych
[print$]
path = /srv/samba/printers
guest ok = yes
browseable = no
read only = yes
write list = smbroot
#katalog domowy
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Answer 1

Hi Ramya,
Following checks may help to resolve the issue.
1) Whether Port 21 is open and allowed to connect with FTP.
2) Ping, FTP and telnet possible from PI box to FTP.
3) User mentioned in Communication channel have authorization for read and write on FTP server.
4) FTP ports are open.
5) Firewall setting done properly.