FireCore has released an update to Seas0nPass 4.4.3 which allows you to jailbreak Apple TV 2G 4.4.3 iOS build 9A4051 Tethered on Windows and Mac OS X both. You can download Seas0nPass 4.4.3 for Windows and Mac from the links given down below.
Yesterday, Apple has released iOS 4.4.3 build 9A4051 firmware update to Apple TV 2G devices, available for download from here. The 4.4.3 iOS (build 9A4051) software update addresses minor bug issues including an audio port while your TV is turned off and added support of Netflix in Mexico.
You can grab the Seas0nPass jailbreak tool from the given below links:
Download Seas0nPass for Windows [Direct Link]
Download Seas0nPass for Mac OS X [Direct Link]