The "Execute a SQL Action" is not working with connections over the Nintex Gateway. This action should work the same way as the "Query a SQL Table" action or the other SQL on-premises actions. This is a defect. The current action does not allow connections over the Nintex Gateway which is the recommended way because it is more secure.
Thank you very much for posting your feedback for our review. At this time, we will not be adding this request to the near-term backlog, as we are focused on other highly requested features. However, we reevaluate requests every quarter and will reach out if priorities change. Please keep the feedback coming as it is critical for our longer-term planning.
Thank you for your feedback, I will now open this idea for voting.