What is the recommended method for allowing a new application on a locked down server?

Adding the path of the application to the lockdown policy is the recommended method for allowing a new application on a locked down server. This approach ensures that the server maintains its security posture while still permitting necessary functionalities. By explicitly allowing the application through the lockdown policy, you create a controlled environment where only authorized applications can run, thus minimizing potential vulnerabilities.

This method also keeps the server compliant with security standards, as it requires any new software to go through an approval process defined by the lockdown policy. It not only prioritizes security but also provides clear documentation of what applications are permitted on the server, making it easier to manage and audit.

In contrast, deleting existing applications compromises the stability and functionality of the server and its services. Changing server settings to be less restrictive undermines the purpose of a lockdown policy and could inadvertently expose the server to threats. Lastly, installing the application without making any policy changes could lead to conflicts with existing security measures and may even lead to the application being blocked later, resulting in a disruptive process to resolve the issue.