Firewall Usage
If you start GPass as an administrator of your computer, GPass displays an option "Control all applications" on the network control page. If you check this option, all applications, including those started outside of GPass, will be under GPass network control. In this regard, GPass functions as a special firewall. Therefore, GPass network rules are also referred to as the GPass firewall.
What is the difference between the GPass firewall and a conventional personal firewall? The two are actually compatible and complementary. The GPass firewall allows you to easily set and switch network rules that are directly used for anti-censorship; this is difficult to accomplish with a regular personal firewall. However, the GPass firewall only controls user applications while conventional personal firewalls usually control all processes including Windows system processes.
When GPass exits, the GPass firewall is no longer in effect. If an application is using the "via GPass" rule, it should now be shut down since it will not be able to access the network. Applications running under other rules can continue as usual.