This error means that the Elastic Job Agent cannot connect to the target server(s) because the target has some firewall rules blocking the connection requests. Indeed – it is required that every target in the target group allows connections from Azure Services in order for Elastic Jobs to work. To fix this, I go to the target server in the Azure Portal and click on the “Firewalls and virtual networks” item under “Security”. Next, I toggle the “Allow Azure services” from OFF to ON, and save my changes.
This has been an interesting series to read through, even though I don’t do much at all with Azure SQL Database.