Tech-WiKi Windows Server Security Event 4775 October 24, 2016June 11, 2017 forumadmin 0 Comments Windows Server Security Event 4775: An account could not be mapped for logon. Authentication Package: %1 Account Name: %2 Related posts: Windows Server Security Event 4774 Windows Server Security Event 4610 Windows Server Security Event 4624 Windows Server Security Event 4776