Error when trying to add a machine to domain across VPN

Hello all, and thanks in advance for any input you can provide me with.

1st We have our main location which uses Windows 2003 server running Active
Directory
2nd We have another location in a seperate city and we have a Windows 2003
Server running at that location.
3rd. We have a VPN connection between both locations and I am able to ping
both sides, I am able to see the servers using the local ip and so forth. I
can ping using the hostname or the ip.
4th What we want to do is connect our server in location two and make it a
Back up Domain Controller to our main office, we are hoping this will help us
so our users can login into the domain in the main location and access
resources.
5th Both locations are running under firelwalls. Do we need to open any
ports on the firewalls?
6th Our main location uses a 4622 Netpoia Router and the second location
uses a Linksys Rv042 router

When trying to add a computer to the domain we get an error though.

The service did not respond to the request in a timely fashion and thus not
allowing us to add machines to the domain.

Also when we use DCPROMO on the second server and use the add an additional
domain controller to the domain we get the same error.

So far we have been unsuccessfull in adding machines to the domain across
the VPN.

Any suggestions or comments that could assist me?

Thanks,
Chris

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"Chris" <(E-Mail Removed)> wrote in message news:448E00BE-2546-470E-9EF5-(E-Mail Removed)...
Hello all, and thanks in advance for any input you can provide me with.

1st We have our main location which uses Windows 2003 server running Active
Directory
2nd We have another location in a seperate city and we have a Windows 2003
Server running at that location.
3rd. We have a VPN connection between both locations and I am able to ping
both sides, I am able to see the servers using the local ip and so forth. I
can ping using the hostname or the ip.
4th What we want to do is connect our server in location two and make it a
Back up Domain Controller to our main office, we are hoping this will help us
so our users can login into the domain in the main location and access
resources.
5th Both locations are running under firelwalls. Do we need to open any
ports on the firewalls?
6th Our main location uses a 4622 Netpoia Router and the second location
uses a Linksys Rv042 router

When trying to add a computer to the domain we get an error though.

The service did not respond to the request in a timely fashion and thus not
allowing us to add machines to the domain.

Also when we use DCPROMO on the second server and use the add an additional
domain controller to the domain we get the same error.

So far we have been unsuccessfull in adding machines to the domain across
the VPN.

Any suggestions or comments that could assist me?

Thanks,
Chris