I recently found my Apple TV to not be appearing in my iTunes meaning I could not stream video to it or access any content on my computer using Home Sharing
The fix is incredibly simple it turns out after hours of Googling and changing settings.
Simply do the following:
1. Go to “http://bthomehub.home”:http://bthomehub.home in your web browser of choice.
2. Go to settings and enter your password.
3. Now go to wireless and select WPA or WPA2 only as your security setting.
4. Do a restart of all devices just to be safe and to make sure everything is saved.
You should now be able to see your Apple TV once again!