MacOS – Change Active Directory Password Expiration Prompt in OS X Yosemite

You might be out of luck. Sounds like the AD authentication isn't caching your credentials locally so you can login when you're away from your AD server.

You can go brute force on the problem:

Hold down the power button your MacBook Pro for ~5 seconds until the machine shuts itself off. Power it back on and use your local credentials to log in instead of your AD credentials.

Once you're back up and running run /System/Library/CoreServices/Directory Utility. Click the lock icon to unlock the settings. Highlight Active Directory in the list and click the pen icon to edit the settings. In the window that pops up click the Show Advanced Options and make sure that Create mobile account at login is checked. This ensures you can login when the AD server isn't present.

In Directory Utility edit your Active Directory settings, under Advanced Options, check "Force local home directory on startup disk". I know this is disappointing as you probably want your documents folder to be your AD user folder, but it doesn't work.