Represents the event code indicating a form authentication failure occurred during a Web request. This field is constant.
Value: 4005
WebEventCodes.AuditFormsAuthenticationFailure is the major code for the health event related to user's authentication failure. When this event happens, ASP.NET raises a System.Web.Management.WebAuthenticationFailureAuditEvent with a major code of WebEventCodes.AuditFormsAuthenticationFailure.