Active Directory problem because of low spaces

Active Directory problem because of low spaces - Resolution with screenshots

Situation: The client can't login to their DC running on Windows 2003 R2 with incorrect username and password error. Access the Event Viewer from another computer, we find this Event ID:

Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1053
User: NT AUTHORITY\SYSTEM
Description:
Windows cannot determine the user or computer name. (The directory service is busy. ). Group Policy processing aborted.

Starting Active Directory gets Naming information cannot be located because There is not enough space on the disk.

Resolution: Free more spaces. Please refer to this post: What's minimum free spaces for Domain Controller?

2. Reboot the DC.

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