I have created a site to site VPN between our main and branch office. It uses the L2TP IPSec protocol between 2 ISA boxes using a pre shared key.
What I Can do:
Ping any machine from our Main to Branch and Vice Versa (IP address only)
Remote desktop to any machine from Main to Branch and Vice Versa (IP address only)
Browse network drives from Main to Branch and Vice Versa (IP address only)
What I can't do:
Ping machines by computer/machine name
Remote desktop to machines by computer/machine name
Join Branch office computers to Main Office Domain (domain controller cannot be located)
Join Branch office computers to Exchange Via Outlook
Scenario for Outlook
User is logged into Branch Domain, start Outlook and Add Exchange account, enter the IP address of the Main Office Exchange server, this then resolves to ourexchange.our-domain.co.
uk and underlines user name, wizard completes successfully. Start Outlook, message.
"Unable to open default e-mail folders. you must connect your Miscrosoft Exchange server computer with the current profile before you can syncronize you folders"
I'm pretty certain that it's a DNS problem, as with the other issues I mentioned, I have attached a network configuration diagram, can anyone see what I'm doing wrong?
Thanks in advance all.