I have a Windows PC in our DMZ that I need to athenticate to our Active Directory. I have seen several lists of different ports that I need to allow through, but they all refer to replication etc. which I don't need: I just want to authenticate! I hope the list just to allow authentication is shorter than any of the lists I've come across so far. If you have a short list of ports, or even a long list if that's really what I need, please let me have it.