http://developers.de/blogs/nadine_storandt/archive/2008/02/04/moss-eventlog-sql-login-failure-eventid-18456.aspxhey guys, if you receive the following error message in your event log you can check some opinions described in this blog post: SQLServer Error: 18456, Login failed for user ‘DEMO\administrator’ This failure mostly came from the SharedService ProviderenCommunityServer 2008 SP1 (Build: 30619.63)