open Windows session

Hi every body,

Can anybody tell me witch port to open to enable windows opening
session from a windows 2003 server.
This server has to communicate with the domain controler that is on
the other side of the firewall.
I have already opened the following ports:
- Kerberos TCP and UDP
- ldap TCP and UDP
- netbios TCP and UDP
- smb TCP and UDP
- RPC 135 TCP and UDP


Thanks for any advice
Have a good day