This article describes an improvement in how Microsoft SQL Server handles a configuration-only replica that uses an Always On availability group that has CLUSTER_TYPE = NONE or CLUSTER_TYPE = EXTERNAL values. This improvement enables you to use the CREATE AVAILABILITY GROUP and ALTER AVAILABILITY GROUP DDL statements to set the SESSION_TIMEOUT property for the configuration-only replica.
This improvement is included in the following update for SQL Server:
Cumulative Update 10 for SQL Server 2017
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