We're going to move to another ADSL line, which means another IP-address. After changing the DNS for our domain name to the new IP address, we have problems with our mail. We have two domain names (olddomain.com and newdomain.com). Olddomain.com is the domain name of our network. Newdomain.com is the domain name we use for our mail.
We first changed the DNS for mail.olddomain.com and mail.newdomain.com to the new IP address. Then mail failed to come in, and I decided to move them back immediately. First I forgot to move mail.olddomain.com, but even after I did this it still looks like mail is going to ISA2. Doing a traceroute it looks like the DNS for the mail is going to the old IP address. (NB: the DNS for the websites newdomain.com and olddomain.com are going to the new IP-address, and that works okay.)
We have two ISA servers (2004) currently, one at the old IP (ISA1), one at the new (ISA2). The new one has problems with the connection to the Exchange server (2003). What's puzzling me is that the configuration of ISA1 are backed up and then imported in ISA2. But for some reason they don't work. Should this be configured in Exchange? What is the problem here, Exchange or ISA?