Hi
Im testing a migration from Exchange 2010 to 2013. I have tried to run a single DNS name to both servers, so externally mail.test.com resolves to the external IP and that NAT's to the new Exchange 2013. Then internally mail.test.com resolves both to EXC13 and EXC10 ip adresses (Round Robin).
I have moved some mailboxes to 2013. If the IP resolves to the new Exchange and i try to login to a mailbox on the old server i get redirected as im supposed to. If the IP resolves to the old Exchange and i try to login with a mailbox on the new server i
get:
A server configuration change is temporarily preventing access to your account. Please close all Web browser windows and try again in a few minutes. If the problem continues, contact your helpdesk.
Should this be possible, or do i need to change the intarnal URL on all virtual directories on the old server to the local netbios name or what to do?