Windows Certificate Store
In the Server-side authentication (SSA) for managers the managers use SSL certificates to authenticate themselves.
The WinCC OA Multiplexing Proxy and the HTTP-Server use SSL for the secure communication.
For the SSL communication/authentication filebased certificates and certificates stored in Windows Certificate Store can be used.
Open the MMC and certificates by typing "cert" into the start menu search field.
Figure 1. MMC - Certificates
![](../../Certificates/images/certs_cert_management.png)
These chapters provide an overview of how to use the Windows Certificate Store certificates: