This morning no one was able to login to the domain until Restarted our Active Directory Server. In the Event viewer I found the following Errors:
NTDS (400) NTDSA: An attempt to write to the file "C:\WINDOWS\NTDS\edb.log" at offset 696832 (0x00000000000aa200) for 512 (0x00000200) bytes failed after 1 seconds with system error 1784 (0x000006f8): "The supplied user buffer is not valid for the requested operation. ". The write operation will fail with error -1011 (0xfffffc0d). If this error persists then the file may be damaged and may need to be restored from a previous backup.
NTDS (400) NTDSA: Unable to write to section 0 while flushing logfile C:\WINDOWS\NTDS\edb.log. Error -1011 (0xfffffc0d).
NTDS (400) NTDSA: The logfile sequence in "C:\WINDOWS\NTDS\" has been halted due to a fatal error. No further updates are possible for the databases that use this logfile sequence. Please correct the problem and restart or restore from backup.
Then I got several of these:
Active Directory was unable to establish a connection with the global catalog.
Once I rebooted the errors ceased but not sure why I would be getting these errors. Please help.