In Plesk, you can set the security policy using the plesk bin command-line utility. The security policy defines a set of rules and recommendations for securing websites and web applications.

Here's how you can set the security policy in Plesk via the command line:

1. Open a Command Line Interface:

   • Access the command line interface of your server. This could be via SSH or a terminal window if you're logged in directly.

2. Use the plesk bin Command:

   The command to set the security policy is:

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   plesk bin security --set --security-policies <policy>

   Replace <policy> with the desired security policy. Plesk typically provides a list of predefined security policies that you can choose from.

3. Example:

   For example, if you want to set the "Maximum" security policy, you would use:

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   plesk bin security --set --security-policies Maximum

4. View Current Security Policy:

   You can view the currently set security policy using the following command:

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   plesk bin security --status

   This will display the current security policy and whether it's enabled or not.

5. Apply the Policy to a Specific Subscription or Domain (Optional):

   If you want to apply the security policy to a specific subscription or domain, you can use the --subscription-name or --domain-name options. For example:

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   plesk bin security --set --security-policies Maximum --subscription-name example.com

   This will apply the "Maximum" security policy to the subscription associated with example.com.

Remember, adjusting the security policy may have implications for the websites hosted on your server, so it's important to carefully consider the policy that best suits your needs. Additionally, always ensure you have a backup of your data before making any significant changes.