Title explains it…
If I join machines to "phoenix.domain.com", the windows 7 login screen displays "PHOENIX" under the login prompt when it is rebooted.
If I simply type a username into the prompt, as well as a password, it returns "invalid username or password".
If I type phoenix.domain.com\User.Name, and the password, it works fine. Once I'm logged in, any priv-escalation requests display domain: PHOENIX, and allow me to log in as would be ex
Best Answer
The shortened version if called the NetBIOS name of the domain, and is there mostly for backwards compatibility. You should, however, be able to login using either the shortname (NetBIOS name) or the FQDN (fully qualified domain name).
If you have issues logging in with one or the other, I would check DNS settings on the workstation first (they should be pointed to the domain controller), and then start to delve into firewall issues.