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Hello, thank you for reaching out to the Microsoft Community. I am here to help and provide assistance with any questions or concerns you may have.
No need to worry about those IIS APPPOOL user profiles – they're just part of the Internet Information Services (IIS) setup on Windows servers. The IIS APPPOOL represents the security setup for an application pool in IIS, running with a specific identity linked to a user or a built-in system account like ApplicationPoolIdentity.
Now, about those profiles you mentioned:
IIS APPPOOL.NET v4.5: This likely stands for the application pool identity of a web app running on .NET Framework version 4.5 or something compatible.
IIS APPPOOL.NET v4.5 Classic: This likely represents the application pool identity for a web app running on the Classic mode of .NET Framework version 4.5 or a compatible version.
These profiles are set up for security and controlling permissions of web apps in those application pools on the server. It's generally advised to leave them be, tweaking their settings without knowing the consequences could mess with how your web apps run.
Speaking of safety, as long as your server and web apps are properly set up and regularly updated with security patches, these profiles aren't a security threat.