Configure a flexible automatic failover policy for an availability group - SQL Server Always On (2022)

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Applies to: Configure a flexible automatic failover policy for an availability group - SQL Server Always On (1) SQL Server (all supported versions) - Windows only

This topic describes how to configure the flexible failover policy for an Always On availability group by using Transact-SQL or PowerShell in SQL Server. A flexible failover policy provides granular control over the conditions that cause automatic failover for an availability group. By changing the failure conditions that trigger an automatic failover and the frequency of health checks, you can increase or decrease the likelihood of an automatic failover to support your SLA for high availability.

The flexible failover policy of an availability group is defined by its failure-condition level and health-check timeout threshold. On detecting that an availability group has exceeded its failure condition level or its health-check timeout threshold, the availability group's resource DLL responds back to the Windows Server Failover Clustering (WSFC) cluster. The WSFC cluster then initiates an automatic failover to the secondary replica.

Note

The flexible failover policy of an availability group cannot be configured by using SQL Server Management Studio.

Limitations on Automatic Failovers

  • For an automatic failover to occur, the current primary replica and one secondary replica must be configured for synchronous-commit availability mode with automatic failover and the secondary replica must be synchronized with the primary replica.

  • Only three replicas are supported for automatic failover.

  • If an availability group exceeds its WSFC failure threshold, the WSFC cluster will not attempt an automatic failover for the availability group. Furthermore, the WSFC resource group of the availability group remains in a failed state until either the cluster administrator manually brings the failed resource group online or the database administrator performs a manual failover of the availability group. The WSFC failure threshold is defined as the maximum number of failures supported for the availability group during a given time period. The default time period is six hours, and the default value for the maximum number of failures during this period is n-1, where n is the number of WSFC nodes. To change the failure-threshold values for a given availability group, use the WSFC Failover Manager Console.

    (Video) 167-AlwaysOn Availability Group on SQL Server Failover Instances Installed in Cluster Mode-4 Nodes

Prerequisites

  • You must be connected to the server instance that hosts the primary replica.

Permissions

TaskPermissions
To configure the flexible failover policy for a new availability groupRequires membership in the sysadmin fixed server role and either CREATE AVAILABILITY GROUP server permission, ALTER ANY AVAILABILITY GROUP permission, or CONTROL SERVER permission.
To modify the policy of an existing availability groupRequires ALTER AVAILABILITY GROUP permission on the availability group, CONTROL AVAILABILITY GROUP permission, ALTER ANY AVAILABILITY GROUP permission, or CONTROL SERVER permission.

Health-Check Timeout Threshold

WSFC resource DLL of the availability group performs a health check of the primary replica by calling the sp_server_diagnostics stored procedure on the instance of SQL Server that hosts the primary replica. sp_server_diagnostics returns results at an interval that equals 1/3 of the health-check timeout threshold for the availability group. The default health-check timeout threshold is 30 seconds, which causes sp_server_diagnostics to return at a 10-second interval. If sp_server_diagnostics is slow or is not returning information, the resource DLL will wait for the full interval of the health-check timeout threshold before determining that the primary replica is unresponsive. If the primary replica is unresponsive, an automatic failover is initiated, if currently supported.

Failure-Condition Level

Whether the diagnostic data and health information returned by sp_server_diagnostics warrants an automatic failover depends on the failure-condition level of the availability group. The failure-condition level specifies what failure conditions trigger an automatic failover. There are five failure-condition levels, which range from the least restrictive (level one) to the most restrictive (level five). A given level encompasses the less restrictive levels. Thus, the strictest level, five, includes the four less restrictive conditions, and so forth.

Important

Damaged databases and suspect databases are not detected by any failure-condition level. Therefore, a database that is damaged or suspect (whether due to a hardware failure, data corruption, or other issue) never triggers an automatic failover.

The following table describes the failure-conditions that corresponds to each level.

LevelFailure ConditionTransact-SQL ValuePowerShell Value
OneOn server down. Specifies that an automatic failover is initiated when one the following occurs:

The SQL Server service is down.

The lease of the availability group for connecting to the WSFC cluster expires because no ACK is received from the server instance. For more information, see How It Works: SQL Server Always On Lease Timeout.

This is the least restrictive level.

1OnServerDown
TwoOn server unresponsive. Specifies that an automatic failover is initiated when one of the following occurs:

The instance of SQL Server does not connect to cluster, and the user-specified health check timeout threshold of the availability group is exceeded.

The availability replica is in failed state.

2OnServerUnresponsive
ThreeOn critical server error. Specifies that an automatic failover is initiated on critical SQL Server internal errors, such as orphaned spinlocks, serious write-access violations, or too much dumping.

This is the default level.

3OnCriticalServerError
FourOn moderate server error. Specifies that an automatic failover is initiated on moderate SQL Server internal errors, such as a persistent out-of-memory condition in the SQL Server internal resource pool.4OnModerateServerError
FiveOn any qualified failure conditions. Specifies that an automatic failover is initiated on any qualified failure conditions, including:

Detection of Scheduler deadlock.

Detection of an unsolvable deadlock.

This is the most restrictive level.

5OnAnyQualifiedFailureConditions

Note

Lack of response by an instance of SQL Server to client requests is irrelevant to availability groups.

(Video) How to Troubleshoot Different scenarios in Always on Availability Groups

Using Transact-SQL

To configure the flexible failover policy

  1. Connect to the server instance that hosts the primary replica.

  2. For a new availability group, use the CREATE AVAILABILITY GROUPTransact-SQL statement. If you are modifying an existing availability group, use the ALTER AVAILABILITY GROUPTransact-SQL statement.

    • To set the failover condition level, use the FAILURE_CONDITION_LEVEL = n option, where, n is an integer from 1 to 5.

      For example, the following Transact-SQL statement changes the failure-condition level of an existing availability group, AG1, to level one:

      ALTER AVAILABILITY GROUP AG1 SET (FAILURE_CONDITION_LEVEL = 1); 

      The relationship of these integer values to the failure condition levels is as follows:

      Transact-SQL ValueLevelAutomatic Is Failover Initiated When...
      1OneOn server down. The SQL Server service stops because of a failover or restart.
      2TwoOn server unresponsive. Any condition of lower value is satisfied, the SQL Server service is connected to the cluster and the health check timeout threshold is exceeded, or the current primary replica is in a failed state.
      3ThreeOn critical server error. Any condition of lower value is satisfied or an internal critical server error occurs.

      This is the default level.

      4FourOn moderate server error. Any condition of lower value is satisfied or a moderate Server error occurs.
      5FiveOn any qualified failure conditions. Any condition of lower value is satisfied or a qualifying failure condition occurs.

      For more information about the failover condition levels, see Flexible Failover Policy for Automatic Failover of an Availability Group (SQL Server).

    • To configure the health check timeout threshold, use the HEALTH_CHECK_TIMEOUT = n option, where, n is an integer from 15000 milliseconds (15 seconds) to 4294967295 milliseconds. The default value is 30000 milliseconds (30 seconds)

      (Video) Microsoft SQL Server 70-462 Tutorial | Configure AlwaysOn Availability Groups

      For example, the following Transact-SQL statement changes the health-check timeout threshold of an existing availability group, AG1, to 60,000 milliseconds (one minute).

      ALTER AVAILABILITY GROUP AG1 SET (HEALTH_CHECK_TIMEOUT = 60000); 

Using PowerShell

To configure the flexible failover policy

  1. Set default (cd) to the server instance that hosts the primary replica.

  2. When adding an availability replica to an availability group, use the New-SqlAvailabilityGroup cmdlet. When modifying an existing availability replica, use the Set-SqlAvailabilityGroup cmdlet.

    • To set the failover condition level, use the FailureConditionLevellevel parameter, where, level is one of the following values:

      ValueLevelAutomatic Is Failover Initiated When...
      OnServerDownOneOn server down. The SQL Server service stops because of a failover or restart.
      OnServerUnresponsiveTwoOn server unresponsive. Any condition of lower value is satisfied, the SQL Server service is connected to the cluster and the health check timeout threshold is exceeded, or the current primary replica is in a failed state.
      OnCriticalServerErrorThreeOn critical server error. Any condition of lower value is satisfied or an internal critical server error occurs.

      This is the default level.

      OnModerateServerErrorFourOn moderate server error. Any condition of lower value is satisfied or a moderate Server error occurs.
      OnAnyQualifiedFailureConditionsFiveOn any qualified failure conditions. Any condition of lower value is satisfied or a qualifying failure condition occurs.

      For more information about the failover condition levels, see Flexible Failover Policy for Automatic Failover of an Availability Group (SQL Server).

      For example, the following command changes the failure-condition level of an existing availability group, AG1, to level one.

      Set-SqlAvailabilityGroup ` -Path SQLSERVER:\Sql\PrimaryServer\InstanceName\AvailabilityGroups\MyAg ` -FailureConditionLevel OnServerDown 
    • To set the health check timeout threshold, use the HealthCheckTimeoutn parameter, where, n is an integer from 15000 milliseconds (15 seconds) to 4294967295 milliseconds. The default value is 30000 milliseconds (30 seconds).

      For example, the following command changes the health-check timeout threshold of an existing availability group, AG1, to 120,000 milliseconds (two minutes).

      Set-SqlAvailabilityGroup ` -Path SQLSERVER:\Sql\PrimaryServer\InstanceName\AvailabilityGroups\MyAG ` -HealthCheckTimeout 120000 

Note

To view the syntax of a cmdlet, use the Get-Help cmdlet in the SQL Server PowerShell environment. For more information, see Get Help SQL Server PowerShell.

(Video) NBU Best Practices for SQL Always On Availability Groups

To set up and use the SQL Server PowerShell provider

  • SQL Server PowerShell Provider

  • Get Help SQL Server PowerShell

To configure automatic failover

Related Content

  • How It Works: SQL Server Always On Lease Timeout

See Also

Overview of Always On Availability Groups (SQL Server)
Availability Modes (Always On Availability Groups)
Failover and Failover Modes (Always On Availability Groups)
Windows Server Failover Clustering (WSFC) with SQL Server
Failover Policy for Failover Cluster Instances
sp_server_diagnostics (Transact-SQL)

(Video) SQL Server "Denali" - AlwaysOn Availability Group Setup

FAQs

How automatic failover happens in AlwaysOn availability groups? ›

Always On Availability Groups monitors the health of both replicas in an automatic failover set. If either replica fails, the availability group's health state is set to CRITICAL. If the secondary replica fails, automatic failover is not possible because the automatic failover target is unavailable.

How do you failover availability group in SQL? ›

Use SQL Server Management Studio
  1. In Object Explorer, connect to a server instance that hosts a secondary replica of the availability group that needs to be failed over. ...
  2. Expand the Always On High Availability node and the Availability Groups node.
  3. Right-click the availability group to be failed over, and select Failover.
14 Sept 2022

How many Always On availability Groups can be configured in always on? ›

DB in only one Availability Group.

You can have more than one AlwaysOn Availability Group on your instance, but databases cannot belong to more than one group.

Can we configure automatic failover of availability groups with SQL Server failover cluster instances? ›

SQL Server Failover Cluster Instances (FCIs) do not support automatic failover by availability groups, so any availability replica that is hosted by an FCI can only be configured for manual failover.

What is SQL AlwaysOn availability group? ›

The Always On availability groups feature is a high-availability and disaster-recovery solution that provides an enterprise-level alternative to database mirroring. Introduced in SQL Server 2012 (11. x), Always On availability groups maximizes the availability of a set of user databases for an enterprise.

How do you check failover in AlwaysOn availability groups? ›

Automatic failover in SQL Server Always On Availability Groups. This type of failover automatically occurs in the case of the primary replica goes down. To verify your AG's support automatic failover, right-click on the availability group and open its properties. It shows the highlighted configuration.

How do I create a failover in SQL Server? ›

Using SQL Server Management Studio

Expand the Always On High Availability node and the Availability Groups node. Right-click the availability group to be failed over, and select the Failover command.

How do I create a failover cluster in SQL Server? ›

Enable the Failover Clustering feature in both the SQL nodes. Confirm the failover cluster installation for SQL Server Always On Availability Groups. Put a tick mark on Failover Clustering and click on Add Features to install the feature with dependency. Review and confirm the installation.

How do you failover a SQL database? ›

To manually fail over database mirroring
  1. Connect to the principal server instance and, in the Object Explorer pane, click the server name to expand the server tree.
  2. Expand Databases, and select the database to be failed over.
  3. Right-click the database, select Tasks, and then click Mirror. ...
  4. Click Failover.
14 Sept 2022

What is the difference between always on and availability groups? ›

Database failures: An availability group is a set of user databases that must failover together. Client connectivity: Always On uses a listener that refers to the primary AG instance. If a failover occurs (manual or automatic), the listener automatically points to the new primary replica.

How do you set up a Always availability group? ›

Steps for Installing SQL Server AlwaysOn Availability Groups
  1. Add Windows Failover Clustering (WSFC) to each replica (server)
  2. Configure WSFC on your primary replica.
  3. Configure SQL Server on each replica.
  4. Configure Logins & Replicas.
  5. Install AlwaysOn.

Which Windows feature is mandatory when using Always On availability Group? ›

Deploying Always On availability groups for HA on Windows requires a Windows Server Failover Cluster (WSFC). Each availability replica of a given availability group must reside on a different node of the same WSFC.

How do I create a SQL Server Always On availability Group cluster in the AWS cloud? ›

Create Always On availability groups
  1. Open SQL Server Configuration Manager.
  2. Open the context (right-click) menu for the SQL instance, and then choose Properties.
  3. On the AlwaysOn High Availability tab, select Enable AlwaysOn Availability Groups, and then choose Apply.
2 Mar 2022

What are the main differences between the SQL Server Always On failover cluster and the SQL Server Always On availability Groups? ›

An SQL AlwaysOn failover cluster instance provides high availability and disaster recovery at the SQL Server level. AlwaysOn Availability Groups (AAG) provide high availability and disaster recovery at SQL database level.

How do you set up a failover? ›

Here are the detailed steps.
  1. Select Configure Failover. Right-click the selected DHCP scope, and select Configure Failover from the context menu. ...
  2. Specify the partner server. ...
  3. Create new failover relationship. ...
  4. Select Finish to complete configuration.

How many databases can you have in an availability group? ›

There is as such no limit defined. Microsoft has tested only upto 10 AG and 100 Databases. If you want to create more AGS, You will have to do so and test the workload you have to see that you do not land into performance issues for same.

How many replicas can I have in an Alwayson availability Group 2016? ›

Basic availability groups use a subset of features compared to advanced availability groups on SQL Server 2016 Enterprise Edition. Basic availability groups include the following limitations: Limit of two replicas (primary and secondary).

What is failover clustering in SQL Server? ›

A Windows Server Failover Cluster (WSFC) is a group of independent servers that work together to increase the availability of applications and services. SQL Server takes advantage of WSFC services and capabilities to support Always On availability groups and SQL Server Failover Cluster Instances.

What is automated failover? ›

Automatic failover is the process of automatically moving an application to a standby server during a failure or service event to preserve its uptime. It can be part of a high-availability approach, or part of a disaster recovery (DR) approach, depending on where the second system is, and how it is used.

What is the difference between geo replication and failover group? ›

Geo Replication is used for only Azure SQL Databases. Failover groups allow you to manage replication and failover of a group of databases on a server or all databases to another region. It provides automatic failover features. Failover groups support only one secondary server.

What is SQL Alwayson? ›

Always On SQL Server is a High Availability and Disaster Recovery solution introduced in SQL Server 2012. It increases the availability by providing a failover environment for Availability Databases that failover together.

How do I test a failover cluster in SQL? ›

Procedure
  1. Open Failover Cluster Manager. ...
  2. To test the failover, right-click the Tivoli Storage Manager cluster resource group and select Move this service or application to another node.
  3. Verify that the failover from the second node to the first node completes successfully.

Which option can you use to stop SQL services without initiating a failover? ›

SQL Server Management Studio

In Object Explorer, connect to the instance of the Database Engine, right-click the instance of the Database Engine you want to start, and then select Start, Stop, Pause, Resume, or Restart.

How do you failover a cluster from one node to another? ›

Use Failover Cluster Manager > Roles > SQL Server role (1) On Action tab, select “Move” (2) and select the node to move the role to (3) Observe that all resources that SQL Server role depend upon are moved to another node and SQL Server role is now running on new node as well (4).

What are 3 requirements that must be met in order to build a failover cluster using Windows Server 2016? ›

All servers must use the same version of Windows Server 2016. All servers must be joined to an Active Directory domain. All servers must use identical hardware components.

How many types of clusters are there in SQL Server? ›

You can choose between two types of clustering: single-instance clustering or multiple-instance clustering (known in SQL Server 7.0 as active/passive and active/active clustering, respectively).

How does failover cluster work? ›

A failover cluster is a group of independent computers that work together to increase the availability and scalability of clustered roles (formerly called clustered applications and services). The clustered servers (called nodes) are connected by physical cables and by software.

How do you check if high availability is enabled in SQL Server? ›

Verify an instance has high availability

In the Google Cloud console, go to the Cloud SQL Instances page. To open the Overview page of an instance, click the instance name. In the Configuration section, it shows Highly available (regional).

What is the difference between mirroring and always on in SQL Server? ›

Mirroring resembles an incomplete AlwaysOn.

Mirroring provides two servers each with its own data storage. The main differences are: Mirrored databases cannot be read. Only one database can be in a mirror.

Do we need SQL Server cluster instances to configure always on? ›

SQL Server Always On is a flexible design solution to provide high availability (HA) and disaster recovery (DR). It is built upon the Windows Failover Cluster, but we do not require the shared storage between the failover cluster nodes.

What are the prerequisites for Alwayson in SQL Server? ›

Requirements from SQL Server side:

Enable Always On Availability Group feature on each server instance. Availability replicas must be hosted on different nodes of one Windows Server Failover Cluster (WSFC). Availability group name must be unique and length should not be more than 128 characters.

How many availability modes are supported by Always On? ›

Always On availability groups supports three availability modes-asynchronous-commit mode, synchronous-commit mode, and configuration only mode as follows: Asynchronous-commit mode is a disaster-recovery solution that works well when the availability replicas are distributed over considerable distances.

How do I check if a SQL Server is always on status? ›

The most basic way to get started monitoring AGs is by using the built-in dashboard in SQL Server Management Studio (SSMS). Once an AG has been created using either T-SQL or SSMS, the Always On Availability Group Dashboard can be opened in SMSS by right-clicking the Availability Databases node.

How does the synchronization process performed in the SQL Server Always On availability Groups between the different replicas? ›

SQL Server maintains the log entries until the time secondary replica becomes available. Once it reconnects with Secondary replica, it sends all log blocks as per the usual process. It increases the transaction log size in Primary replica until the secondary replica is unavailable.

How do I set up AlwaysOn availability Groups in SQL 2016? ›

Run the SQL Server Configuration Manager and double-click the SQLServer (MSSQLSERVER) service to open the Properties dialog box. Select the Always On High Availability tab in the Properties dialog box and check off the Enable Always On Availability Groups checkbox. Click OK when prompted to restart the Server service.

What are the minimum requirements of a database to be part of the Always On availability Group? ›

Checklist: Prerequisites (Server Instance) The host computer must be a WSFC node. The instances of SQL Server that host availability replicas for a given availability group reside on separate nodes of the cluster. An availability group can temporarily straddle two clusters while being migrated to different cluster.

Can you write on a database that is a part of an always on availability group from the secondary replica? ›

Though you cannot write data to secondary databases, you can write to read-write databases on the server instance that hosts the secondary replica, including user databases and system databases such as tempdb.

What is always on failover cluster instances? ›

SQL Server Always On Failover Cluster Instances (FCIs) use Windows Server Failover Clustering (WSFC) to provide high availability at the server instance level. An FCI is a single instance of SQL Server that is installed across WSFC nodes to provide high availability for the entire installation of SQL Server.

What is SQL Server Always On availability Group? ›

The Always On availability groups feature is a high-availability and disaster-recovery solution that provides an enterprise-level alternative to database mirroring. Introduced in SQL Server 2012 (11. x), Always On availability groups maximizes the availability of a set of user databases for an enterprise.

What is the difference between always on and availability groups? ›

Database failures: An availability group is a set of user databases that must failover together. Client connectivity: Always On uses a listener that refers to the primary AG instance. If a failover occurs (manual or automatic), the listener automatically points to the new primary replica.

How do you failover in Alwayson availability groups step by step? ›

In Object Explorer, connect to a server instance that hosts a secondary replica of the availability group that needs to be failed over. Expand the server tree. Expand the Always On High Availability node and the Availability Groups node. Right-click the availability group to be failed over, and select Failover.

How do you check failover in AlwaysOn availability groups? ›

Automatic failover in SQL Server Always On Availability Groups. This type of failover automatically occurs in the case of the primary replica goes down. To verify your AG's support automatic failover, right-click on the availability group and open its properties. It shows the highlighted configuration.

How do I change failover mode always on? ›

Expand the Always On High Availability node and the Availability Groups node. Click the availability group whose replica you want to change. Right-click the replica, and click Properties. In the Availability Replica Properties dialog box, use the Failover mode drop list to change the failover mode of this replica.

How do I enable Always On availability Groups? ›

In SQL Server Configuration Manager, click SQL Server Services, right-click SQL Server (<instance name>), where <instance name> is the name of a local server instance for which you want to enable Always On Availability Groups, and click Properties. Select the Always On High Availability tab.

How do I setup a failover cluster in SQL? ›

Enable the Failover Clustering feature in both the SQL nodes. Confirm the failover cluster installation for SQL Server Always On Availability Groups. Put a tick mark on Failover Clustering and click on Add Features to install the feature with dependency. Review and confirm the installation.

What is DHCP failover and what do you need to consider when configuring it? ›

The DHCP failover protocol provides a method for two DHCP servers to communicate with each other. Depending on the configuration, DHCP failover can provide both redundancy and load balancing by sharing one or more pools between two or more DHCP servers. The servers are known as failover peers.

What is automated failover? ›

Automatic failover is the process of automatically moving an application to a standby server during a failure or service event to preserve its uptime. It can be part of a high-availability approach, or part of a disaster recovery (DR) approach, depending on where the second system is, and how it is used.

What is the difference between AlwaysOn failover cluster instances and AlwaysOn availability groups? ›

An SQL AlwaysOn failover cluster instance provides high availability and disaster recovery at the SQL Server level. AlwaysOn Availability Groups (AAG) provide high availability and disaster recovery at SQL database level.

Why does failover happen? ›

Failover occurs when users cannot access the server that contains the database they want or they cannot access the database itself. When a user tries to open a database that is not available, the Cluster Manager looks in the Cluster Database Directory for a replica of that database.

How do you do a Mirrorover failover? ›

To manually fail over database mirroring
  1. Connect to the principal server instance and, in the Object Explorer pane, click the server name to expand the server tree.
  2. Expand Databases, and select the database to be failed over.
  3. Right-click the database, select Tasks, and then click Mirror. ...
  4. Click Failover.
14 Sept 2022

What are the two configurations of failover system? ›

Server failover configurations are either active-active or active-standby.

How do you automate in failover? ›

In case of a failure, the application can automatically failover to a backup system, including all application environment start. Some customers want control over the failover processing. In this situation, the system will require a response for failover processing to occur.

What is the difference between failover and high availability? ›

A part of high availability is failover which we define as the ability for client connections to migrate from one server to another in event of server failure so client applications can continue to operate. JBoss Messaging provides high availability by replicating servers in pairs.

How many databases are in AlwaysOn availability group? ›

An availability group supports one set of primary databases and one to eight sets of corresponding secondary databases. Secondary databases are not backups.

How do I setup a failover cluster in SQL? ›

Enable the Failover Clustering feature in both the SQL nodes. Confirm the failover cluster installation for SQL Server Always On Availability Groups. Put a tick mark on Failover Clustering and click on Add Features to install the feature with dependency. Review and confirm the installation.

How do you set up a Always availability group? ›

Steps for Installing SQL Server AlwaysOn Availability Groups
  1. Add Windows Failover Clustering (WSFC) to each replica (server)
  2. Configure WSFC on your primary replica.
  3. Configure SQL Server on each replica.
  4. Configure Logins & Replicas.
  5. Install AlwaysOn.

What causes a SQL Server failover? ›

Usually, failover cluster failure is to the result of one of two causes: Hardware failure in one node of a two-node cluster. This hardware failure could be caused by a failure in the SCSI card or in the operating system.

What is the difference between failover and fallback? ›

Failover and Failback Summary

When an error is detected a failover workflow changes data sources to a recovery system while a failback workflow restores data back to the original state after a ransomware event or other corporate data loss.

What is failover in SQL? ›

In the event of an instance or zone failure, the standby instance becomes the new primary instance. Users are then rerouted to the new primary instance. This process is called a failover.

How do I create a mirror server? ›

Configuring the Mirror Server
  1. Open the swServer. ini in the mirror server installation in a text editor.
  2. Configure the settings in the MirrorServer section using the below entries.
  3. Comment out the MainServer section.
  4. Save your changes.
23 Sept 2022

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