cannot connect to library

Home sharing with the new Apple TV / iTunes update is just broke. Only works for a bit unless you restart iTunes or disable / re-enable Home Sharing. Use to work great until the last updates. This is not a network (router, firewall, ...) issue - just a (bad) regression in Apples software. Hopefully they fix this soon, hard to believe its been broke this long already. The Remote app update also fails to connect to Apple TVs (but does connect to iTunes) for many people as well. Poor QA all around. :(

I have yet to see any suggestion that actually works other than reverting to previous versions of fwr / iTunes - which is a pain / joke to do.

There are a *ton* of posts about this:

https://discussions.apple.com/thread/3845423?answerId=18078180022#18078180022

https://discussions.apple.com/thread/3808863?answerId=18078351022#18078351022

https://discussions.apple.com/thread/2613875?answerId=18078326022#18078326022

https://discussions.apple.com/thread/3860579?answerId=18078599022#18078599022

https://discussions.apple.com/thread/3861987?answerId=18078600022#18078600022

https://discussions.apple.com/thread/3865393

https://discussions.apple.com/thread/3864199

etc...

If you're using a wireless router, make sure to disable IGMP Proxy. This will allow your connection to go through and easily share your content with your Apple TV.