Assume that you use Always On Availability Groups in Microsoft SQL Server 2017 on Linux. The startup of a database that belongs to an availability group may time out. Additionally, a stack dump is generated on the primary replica, and an error message that resembles the following is logged on the secondary replica:

A connection timeout has occurred while attempting to establish a connection to availability replica replica_name with id replica_id. Either a networking or firewall issue exists, or the endpoint address provided for the replica is not the database mirroring endpoint of the host server instance.


This fix is included in the following update for SQL Server:

Cumulative Update 8 for SQL Server 2017

About SQL Server builds

Each new build for SQL Server contains all the hotfixes and security fixes that were in the previous build. We recommend that you install the latest build for your version of SQL Server:

The latest build for SQL Server 2017


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


Learn about the standard terminology that Microsoft uses to describe software updates.

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