Explanation
A misconfiguration in the firewall can block the communication between the web application and the managed database, preventing the web application from receiving data. A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on predefined rules1. A deployment script template is a way to automate the deployment of resources and configurations in Azure Resource Manager1. If the script template contains incorrect or conflicting rules for the firewall, it can cause the issue.
References: CompTIA Cloud+ CV0-003 Exam Objectives, Objective 2.2: Given a scenario, deploy and test a cloud solution ; Use deployment scripts in templates - Azure Resource Manager1