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