Siemens SCALANCE M-800 Series Getting Started page 130

VPN tunnel between SCALANCE M-800 and S612
3.3 Secure VPN tunnel with certificates
4. Click on the "HTTP" tab in the content area.
5. Click on the "Load" button beside "IPSecCert" or "X509cert". The dialog for loading a file
is opened.
Navigate to the remote certificate.
6. Click the "Open" button in the dialog.
The file is now loaded on the device. After loading successfully, confirm the next dialog
with "OK".
7. Repeat steps 5 and 6 for the PKCS12 file.
Result
The certificates are loaded. With "Security" > "IPSec VPN" > "Certificates", you can display
the certificates. The loaded certificates must have the status "valid".
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SCALANCE M-800 Getting Started
Getting Started, 06/2015, C79000-G8976-C337-04