The settings, which are under the "
[Engine.GameInfo]" section of your .ini file come in the form of "
IPPolicies[0]=ACCEPT,*". They are used to control IP addresses which are accepted or refused by your sever.
The first setting, "ACCEPT", means to allow any addresses that fit the pattern following the comma. For instance, "ACCEPT,192.168.0.*" will allow all connections from 192.168.0.0 to 192.168.0.255. The keyword "DENY" will refuse a connection to any IPs that match the pattern given.
You can use a mix of ACCEPTs and DENYs to tailor who you want to allow or refuse connection to your server.