Windows Security Log Event ID 4775
Operating Systems Windows 2008 R2 and 7
Windows 2012 R2 and 8.1
Windows 2016 and 10
Category
 • Subcategory
Account Logon
 • Credential Validation
Type Failure
Corresponding events
in Windows 2003
and before
679  
Discussions on Event ID 4775
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4775: An account could not be mapped for logon

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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

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An account could not be mapped for logon.

    Authentication Package:  %1
    Account Name:  %2

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