1. ^{Bring up the Windows Control Panel}
2. ^{Start the Windows Firewall control program}
3. ^{Select its Exceptions tab}
4. ^{Click [Add Program]}
5. ^{Click [Browse]}
6. ^{Navigate to wherever you've installed the sim (C:\Program Files (x86))\iRacing, by default)}
7. ^{Select one of the .exe's in that folder}
8. ^{Do this same thing for the other .exe's in the folder.}