How do I fix permission issues for an application pool identity in IIS .NET Core?

To fix permission issues, identify the application pool identity (usually `ApplicationPoolIdentity`). In Windows Explorer, locate the application's directory on the server. Right-click the directory, select 'Properties', navigate to the 'Security' tab. Add the application pool identity and grant it read, write, and execute permissions. Alternatively, use the IIS Manager to configure permissions directly on the application pool, or change the application pool identity to a user account that has appropriate permissions.