Database Connectivity disruption during failover and failback

Hi,

We are using SQL Server 2012 SP3 and we are using AlwaysOn Availablity Group for our HA-DR solution.

We have 2 node Windows Cluster (Windows Server 2012 R2 is the OS for each of the server) in two different subnets holding the SQL Server instances participating on the AlwaysOn Availability Group. As a result the Listener is also configured with two IPs (one from each subnet). Both the instances are configured for Automatic Failover.

The only changes we have made in the cluster properties are the HostRecordTTL value is set to 300 and RegisterAllProvidersIP to 0 for the Listener object, else all are kept as default.

The problem we are facing is that whenever any failover happens, the applications fail to connect the databases for few minutes after the failover completes. So wanted to know if there are any configurations that we have missed so that the failover becomes seamless from the application side i.e, no database connection disruption during or immediate after the failover.

Please let me know if any other information is required for this purpose.

Thanks and Regards,
Pinaki