Question : Exchange 2007 webmail access from outside the domain

Hi ... I have a new Exchange 2007 server on a domain with an existing Exchange 2003 server. Only a few test accounts have been migrated to the 2007 server and they seem to work fine (can send and receive mail, have access to the GAL and Public Folders) with the exception of access their accounts from outside the domain via webmail. I can put in the private-side address of the server "http://servername.privatedomainname.com/owa" and it works fine. When I go home and try to access our public "http:\\owa.publicdomainname.com" owa site (hosted by Exchange 2003) I get the "Internet Explorerer cannot display the webpage" error. When I click on the "more info" button I get "The problem can be caused by a variety of issues, including: Internet connectivity has been lost. The website is temporarily unavailable. The Domain Name Server (DNS) is not reachable. The Domain Server (DNS) does nothave a listing for the website's domain. If this is an HTTPS (secure) address, click tools, click Internet Options, click Advanced, and check to be sure the SSL and TLS protocols are enable un the the security section. The link that displays on the address bar on the error page points to the Exchange 2003 OWA (http://owa.publicdomainname.com/exchweb/bin/auth/owaauth.dll). It looks like 2003 OWA isn't allowing passthrough to the accounts on the 2007 server? Since I can webmail to the 2007 server within the domain, I'm sure it is some DNS setting or perhaps a setting on the 2003 OWA/IIS.

Thanks,
Jay

Answer : Exchange 2007 webmail access from outside the domain

The port change required is in the firewall, not in the Exchange Server. You'd simply need to reconfigure the firewall such that port 443 goes to the IP of the Exchange 2007 box, not the 2003 server.

As some further reading, I'd suggest you take a look at http://msexchangeteam.com/archive/2007/02/07/434523.aspx with regards to OWA co-existing between Exchange 2003 and 2007.

-Matt