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Configuration of Outlook with RPC/HTTP

KOAC
KOAC asked
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Last Modified: 2013-11-05
Hi
I have a problem when configuring Outlook with RPC/HTTP. I have an internal exchange 2003 server configured on our domain with the system name "exchange.abc.com". I have registered an mail server with the name of "mail.xyz.com" having a public ip address of "100.100.100.100". This public ip is mapped to our internal mail server through the firewall such as "100.100.100.100" is mapped to "192.168.100.20". OWA works fine from a public network. Now I need to configure outlook to access my exchange server from a public network. I have enabled RPC/HTTP on exchange Server. And i configured RPC/HTTP on outlook for it to be accessed from outside. Now when I enter the mail server as "mail.xyz.com" [External Mail Server] and the username as "John" and when i click on "CHECK NAME", after a long time it finds the username "John" but my Mail Server changes from "MAIL.XYZ.COM" to "EXCHANGE.ABC.COM". That is , it changes the mail server name from external to internal and does not allow Outlook to authenticate. I can see the mail server and username "UNDERLINED" to confirm that it can see the server details. Can you suggest the proper method to configure RPC/HTTP and if there are any DNS Settings that need to be changed?
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We have tried all the above mentioned things. Outlook is still not able to connect to my Front End Server.
Our server is lying in DMZ zone. Which are the ports need to open between front end & back end server.
And what ports are required to open on from front end server to External network.

Please guide us. I think the issue is pending due to blockage of ports.
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>>Which are the ports need to open between front end & back end server.

Hundreds of ports - this is exactly why you don't put a front end server in the DMZ, it only weakens security

>>And what ports are required to open on from front end server to External network.

Usually, only TCP ports 443 and 25 are needed to an Exchange server - that will give you all required mail functionality.

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