how to solve "The connection to the primary replica is not active. The command cannot be processed." in SQL Server?

This error message in SQL Server indicates that there is a problem with the connection to the primary replica of an availability group. An availability group is a set of databases that are replicated and distributed across a group of SQL Server instances.

Here are some steps you can take to address this issue:

Check the availability group dashboard: The dashboard provides a quick overview of the availability group and can help identify any issues with the primary replica. Use this information to troubleshoot the problem further.
Check the network connectivity: Make sure that the network connection between the primary replica and the secondary replica(s) is stable and not interrupted. You can test the connection by pinging the primary replica from the secondary replica(s) and vice versa.
Check the SQL Server error log: Check the SQL Server error log on the primary replica to see if there are any error messages that indicate a problem with the primary replica or the availability group.
Check the AlwaysOn Health Event Viewer: The AlwaysOn Health Event Viewer provides detailed information about the availability group health and can help identify any issues with the primary replica.
Restart the SQL Server service: Restarting the SQL Server service on the primary replica can sometimes resolve the issue.
Failover to a secondary replica: If the issue persists, you may want to initiate a failover to a secondary replica. This will make the secondary replica the new primary replica and can help resolve the issue. Make sure to test the failover process regularly to ensure that it works as expected.

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