Join a domain as a member server from across internet

I have a Win2000 Domain across town out on a DMZ.  I have Win2003 on a DMZ at home. I am attempting to join that domain across town as a member server before promoting to a DC.  I have set the DNS of the Win2003 server to the domain across town, and it resolves fine.

Every time I attempt to join, I am prompted for credentials.  After providing sufficient credentials, I get an error "Cannot join, Network path not fond".  

Do I need to VPN through to join from across town?

If so, do I need to maintain the tunnel in order to maintain the remote sites functionality?

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

When joining the domain, are you using the fully qualified domain name instead of the short netbios name?  
Here is a link you probably need.

EfpavAuthor Commented:
It is not the NetBIOS helper service.  It is running on both machines.  

Am I using the FQDN???   When joining a domain, the NetBIOS name plus the domain name becomes the FQDN.  Using the FQDN in the NetBIOS name box will result in an error because of the periods, so I guess I am not really sure what you mean...
I would suspect that you will need a VPN.
The key port that Windows needs for domain traffic (port 135) is blocked by most ISPs as you shouldn't be sending that type of traffic over the Internet.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Sorry Efpay, it was pretty late last night.  Sembee is right.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows Server 2003

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.