Failed Logon with Blank Caller Computer

Blank Caller comPuter name with Eventid 4740 on Domain Controllers

http://powershell-guru.com/powershell-tip-90-troubleshooting-event-4740-lockout-with-caller-computer-name-blank-empty/

   
# Enable netlogon verbose logging on Domain Controller
nltest /DBFlag:2080FFFF
 
# Search entries with the username "administrator"
Select-String -Path "C:\Windows\debug\netlogon.log" -Pattern 'administrator'
 
# Disable netlogon verbose logging on Domain Controller
nltest /DBFlag:0x0