If none of these apply, you need to seriously question why you would allow access from the internet to a service. There are ways and means to specify different access rights depending on where a user accesses WinGate from. You can either create duplicate services bound to the different interfaces with different policies per service, or you can do it with a single service, with location based policies. E.g. POP3 service using service specific rules. The second can connect from anywhere, but is restricted by request - say only allow connections to certain servers or ports.
More help is at hand.
The help documentation that comes with WinGate has more information on security, and you can always find help in the users forum and the support list.