We have a 2 way trust between AD sites in our org.
The entire subnets are either VPN, or MPLS but they completely communicate with each other.0
DNS resolve completely between the 2 domains.
We have 2 Exchange 2010 SP3 environments which we are bringing in to 1.
Here is the issue:
We are performing move-request between the two exchange environments because the target Exchange environment is replacing the source, and we are linking the mailboxes to the user account of the source domain, because the user accounts aren't changing. For some reason, some users are getting prompted for a password every time they open outlook, while other users are not. When I checked the connection status in outlook it shows that the users getting prompts are connecting via HTTP and authenticating NTLM, so its seeing the connections as remote like they are connecting via outlook anywhere. Other users are fine and when looking at the connection status they are connecting locally. These users are on multiple subnets but all local. Subnets are set by floors. Any idea why some users are being connected via HTTP and other TCP\IP local. They are all connecting to the same exchange servers.
DAG with 2 DBs and 2 nics for MAPI and Storage traffic
2 HUB Servers
2 CAS servers with Windows NLB (Cas Array)