iRacing

Open Windows Control Panel

Click Windows Defender Firewall

Click Allow an app or feature through Windows Defender Firewall

Click Change Settings

Then click Allow another app

click Browse and add (one by one) to where you have iRacing installed (by default this is C:/Program Files (x86)/iRacing) and add the following application files (not the .sgn files):

iRacingLauncher64

iRacingLocalServer64

iRacingService64

iRacingSim64DX11

then in iRacing/ui folder:

iRacingUI

and in iRacing/updater:

iRacingUpdater