Windows Certificate Store
In Server-side authentication (SSA) for managers, SSL certificates are used to authenticate the managers.
The WinCC OA Multiplexing Proxy utilizes SSL to ensure secure communication.
The HTTP-Server certificates cannot be converted into Windows Certificate Store format and imported to Windows Certificate Store.
SSL Certificates
For SSL communication and authentication, both file-based certificates and certificates stored in the Windows Certificate Store can be used.

These chapters provide an overview of how to use the Windows Certificate Store certificates: