Event ID 4776 logs NTLM credential validation attempts on domain controllers
Shows authentication package, account name, source workstation, and error code
Available in Windows 2008 R2 through Windows 10 and Windows Server 2019-2022
Troubleshooting Methods
Use Wireshark to capture traffic and identify authentication sources
Enable NetLogon debugging utility for detailed authentication logs
Run DCDiag for domain controller health checks
Implement firewall whitelisting or VPN for remote authentication
Security Monitoring
Monitor for unauthorized NTLM authentication attempts
Identify relay and cracking attacks
Detect brute force and enumeration attacks
Monitor suspicious logon times and accounts
Monitoring Tools
Windows Event Viewer provides basic monitoring capabilities
ADAudit Plus offers advanced monitoring and reporting features
Both tools can be used together for comprehensive security analysis
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