Hi,
thx for the answer and sorry for the wrong reply. ( i'm so used to push reply :D )
i've put an stunnel.conf file in /etc/stunnel directory
with

client=yes
[active directory]
accept=localhost:389
connect=192.168.1.101=636
like you said
 ( win2003server ip is 192.168.1.101 )

I did an ps -ef | grep stunnel which gave me this output
root 1218 1 0 15:54 ? 00:00:00 /usr/sbin/stunnel stunnel.conf

SO i think it is normally running. ( also logged off and checked it without any problem )
But the question is now how can i be sure the communication goes true that "tunnel".
I checked with firewall of server. Whem i close all ports except 636 the linux clients fails working when i add 389 with it it works :s. So it is still throwing all trafic towards 389 ?

( what i want is all trafic which the client wants to send at 389 of server goes true 636 which is ssl port with a less as possible problems with certificates)

greetz