VPN tunnel between SCALANCE M-800 and security CPs 
  4.3 Secure VPN tunnel with certificates 
SCALANCE M-800 Getting Started 
Getting Started, 06/2015, C79000-G8976-C337-04 
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6.  For this configuration example, configure the group properties with the following settings: 
 
If you use different parameter settings, it is possible that the two tunnel partners will not 
be able to set up a VPN connection between them. 
7.  Select the menu command "Project" > "Save". Save the security project under the 
required name. 
The configuration of the tunnel connection is complete. The settings are saved in the 
configuration file.