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Exchange 2003 Front end back end question

I recently installed a Microsoft Exchange 2003 SP 2 front end server, this server is located behind my firewall. I also have an Exchange 2003 (No service pack) Back End server. I am trying to set up Outlook Web Mail. I am able to log into the back end server using Http://servername/exchange/mailbox. I get a login box and I enter the Domain/Username and the password and I am able to use the Outlook Web page. When I try to log into the front end server using the Http://servername/exchange/mailbox.I get the login box and enter the Domain/user name and the password. I try three times and get access denied. It is like I am not able to authenticate. I have completely rebuilt the server a few times. Both servers are running Windows 2003 SP1.

Do both exchange server need to be on the same service pack?

Thanks,

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mass2612

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poweruser32

which server are your mx records pointing to owa should only be got on one server in your case
have you the ports (GC and AD) open to the BE server

Sembee

Are you, or have you ever used SSL? That can upset things on authentication.
However considering the gap between versions I would suggest that you upgrade the backend server to SP2 before you start looking at anything else as being the cause.

Simon.