I thought I would share a solution that Support helped with using a JDBC Query node along with integrated authentication. After upgrading to v3.6.5 the node stopped working.
Placing the "sqljdbc42.jar" file from Microsoft (which can be found here: https://www.microsoft.com/en-us/download/details.aspx?id=11774 and is also attached) anywhere on the computer/server it then updating the DbDriverClasspath in the node properties (see attached) solved the problem.
I hope you find this helpful if you have encountered the same issue.
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