Windows Security Log Event ID 4775

4775: An account could not be mapped for logon

On this page

• Description of this event
• Field level details
• Examples
• Mini-seminars on this event

I have not actually seen this event logged by Windows but suspect that it if it is logged at all it would be in conjunction with IIS's certificate mapping capability where users are authenticated via a client certificate which is then mapped to a Windows user account according to mapping rules defined in IIS.

I haven't been able to produce this event. Have you? If so, please start a discussion (see above) and post a sample along with any comments you may have! Don't forget to sanitize any private information

Free Security Log Resources by Randy

• Free Security Log Quick Reference Chart
• Windows Event Collection: Supercharger Free Edtion
• Free Active Directory Change Auditing Solution
• Free Course: Security Log Secrets

Supercharger Free Edition

Your entire Windows Event Collection environment on a single pane of glass.

Free.

 

Mini-Seminars Covering Event ID 4775 27 Most Important Windows Security Events

 

Upcoming Webinars Assessing the Security of Your Active Directory: User Accounts Anatomy of a Cloud Hack: The Cloudflare/Okta Compromise – A Story of Tokens, Lateral Movement, Persistence and the Salvation of Zero Trust and Hard MFA Tokens

Additional Resources

•	Event IDs
•	All Event IDs
•	Audit Policy