In the following screenshot, we can see port 5123 is configured Applications need to use this port in their connection string. Ideally, we should use a different port for SQL listener. We can use the default SQL port 1433 as well however, we need to ensure that no other services, on the cluster node, should use this port as it can cause a port conflict. Provide the following information in the Add Listener wizard. To configure a Listener in SQL Server Always on Availability Group, expand the Availability Group Listener node in SSMS. In the following screenshot, we configured a SQL listener on a three node replica. The client application does not need to know the underlying configuration of Always On replica. A virtual network name always points to the primary replica. In SQL Server Always On, we can define a SQL Server Always On Availability listener for all user connections. It is not an ideal scenario to change the application connection string each time after a failover. It has a drawback in that if failover happens and the secondary replica takes over the role as primary, all user connections need to repoint to the new primary replica after failover. In the application configuration, we can use the Primary replica instance name. We can do read-write operations on the primary replica only. Suppose we have two replicas using synchronous data commit mode. Overview of SQL Server Always On Listeners We can create multiple secondary replicas with a combination of synchronous and asynchronous data commit. SQL Server Always On Availability Groups provides a HADR (high availability and disaster recovery) solution with multiple replicas. This article on SQL Server Always On Listeners includes an overview and various connection configurations for specifying MultiSubnetFailover including SSMS, ODBC, ADO.NET, as well as MultiSubnetFailover limitations and how to connect to all IP addresses via RegisterAllProvidersIP.
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