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"Login failed" (Error 18456) error messages in SQL Server - Web links Compilation

Please check the link for a list of Error States explained in detail for the Logon Errors 18456 on SQL Server.

http://sqlblog.com/blogs/aaron_bertrand/archive/2011/01/14/sql-server-v-next-denali-additional-states-for-error-18456.aspx

http://blogs.msdn.com/b/sql_protocols/archive/2006/02/21/536201.aspx

These are for now, and will add to this if there are any more useful found.
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