If you see the error message 'The account name or password you entered does not match an account in our records', use this article to resolve the issue.
This just happened to us too. Worked fine before, and works on iPad, etc. Just Apple TV. Doe we contact Apple or Netflix? Did anyone try a restore or a password reset? Did waiting help? We ended up watching via our PS3. Too bad, the ATV
the same appletv device was used for about a year, then sat in a box for a while and is now connected at a new location (new house, new ISP). i enter user/password that work on other devices including a TiVo and a Samsung blu-ray player.