**This article relates to AirParrot 1. As of September 2016, support for AirParrot 1 has ended. We encourage you to upgrade to AirParrot 2 for the best compatibility with new devices.**
If your AppleTV doesn't display in the AirParrot menu, your computer isn't able to see the AppleTV for one reason or another.
If you're on a home network, the firewall on your computer may be preventing the devices from communicating. It's also possible that the firewall on your router is preventing communication.
Microsoft has included instructions for allowing applications through the Windows firewall here:
If you're using a Mac, Apple has provided similar instructions here:
Computers also sometimes use Antivirus applications for security. These applications can have their own firewalls blocking connections. You may need to make allowances for the Airplay Mirroring Client within these applications to allow the connection.
Corporate networks often block a number of ports from communicating across networks. You may need to have your IT department allow TCP ports 7000, 47000, 7100, 49228, 50259 and UDP 62572, 54780 to be open to communicate. The network must be configured to run in Multicast and also allowed to run Bonjour and mDNS. It's also common for corporate and education networks to implement segmentation with VLANs or other similar methods. While Apple doesn't specifically support this, there are methods to make AirParrot work. Please contact our support team for assistance if this is the case.
Apple has provided more instructions on this issue here: http://support.apple.com/kb/TS4215