ScreenBeam requires Windows to temporarily open a port to stream content to the TV. Click Allow when the message appears. Some anti-virus software settings can be more restrictive than others, and you may not get a notification at all. If you are using anti-virus software and ScreenBeam is not operating properly, you may need to temporarily disable the anti-virus software, and re-enable it after using ScreenBeam. If the problem persists, consult your antivirus user guide for the proper configuration for ScreenBeam to operate.