You'll need to allow the following programs (most are in the bin folder) to host and connect to localhost:

• g2hr_native.exe (g2hr_native.bin on Linux)
• g2hr_menu.exe
• g2hr.exe
• G2HR_Player1.exe ... G2HR_Player6.exe

If you can't get it to work, please report a bug.

More information about why these components are needed and what each of them does can be found here.