We are using Exchange 2003 on windows 2003.
We are setting up OWA using a front end server in the DMZ and a back end server on the LAN. I have configured the ports on our external firewall to allow only ports 80, 443 and NAT'd the public IP to the front end server IP but my question is regarding the communication beween the front end server and back end server and exactly which ports I need to open for all this to work. This should include any ports for global catalog and AD reference and of course exchange front end/back end communication.
Can someone supply an exact list of the ports to open.
Thanks in advance