I have an Exchange 2019 environment comprised of two mailbox servers (and an Edge Transport server). The two mailbox servers are in one DAG which is working fine. However, when I take down one of the servers in the DAG I lose Outlook client connectivity. I perform a Server Switchover before taking the server down so the passive databases mount and activate properly. And the Outlook clients are okay until I actually take the server down.
Mail is still flowing (i.e. mail is not getting held up in queues either on the mailbox server or the Edge Transport server) so I am confident the connectors are working properly.
OWA is working fine both on the network and outside the network so I know the mailbox database is working properly.
I suspect the problem is with Autodiscover as the Config.XML file on the client does not change to reflect the need to redirect to the other server. I haven’t changed any of my Virtual Directories since creating the DAG (i.e. the virtual directory paths point to the servers not the DAG). And wondering if I need to change the virtual directories to point to the CNO for the DAG instead of the Exchange server itself. If this what I need to do resolve the Outlook connectivity issue, which virtual directories do I need to change?