This data source could not be saved for the following reason: The driver could not establish a secure connection to the SQL Server by using Secure Socket Layer (SSL) encryption Error: "The server selected protocol version TLS10 is not accepted by client preference [TLS13, TLS12]".
This error occurred after upgrading to v12 with Tomcat 10 and Java 17. At the time these data sources were showing as disconnected. The MS SQL driver being used didn't support Java 17 and was replaced by a newer driver 11.2 that did support Java 17. However, this did not resolve the error as it was being returned by the SQL server itself.
As it turned out the SQL servers were older and only supported TLS1.0.
Resolution: In the Admin Console > Data Sources, the data source type needed to be changed to use the JTDS driver that supported the older TLS1.0.
To do this the selector field need to be unlocked using the browser developer tool.
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