SQL Server 2008: Maintenance Plan error - 'Alter failed for Server...'

This script is useful for security audits (helping you gather information about failed login attempts), and for checking recent activity by a particular login (before you delete a login, for example).
The script lists all failed login attempts by a user, including the IP address of the computer from which the login attempts were made. The last successful login for a user is also listed.
Note that security logging must be enabled on the SQL Server you are monitoring, otherwise this script will not return accurate results.

 

DECLARE @TSQL  NVARCHAR(2000)
DECLARE @lC    INT
CREATE TABLE #TempLog (
      LogDate     DATETIME,
      ProcessInfo NVARCHAR(50),
      [Text] NVARCHAR(MAX))
CREATE TABLE #logF (
      ArchiveNumber     INT,
      LogDate           DATETIME,
      LogSize           INT
)
INSERT INTO #logF   
EXEC sp_enumerrorlogs
SELECT @lC = MIN(ArchiveNumber) FROM #logF
WHILE @lC IS NOT NULL
BEGIN
      INSERT INTO #TempLog
      EXEC sp_readerrorlog @lC
      SELECT @lC = MIN(ArchiveNumber) FROM #logF 
      WHERE ArchiveNumber > @lC
END
--Failed login counts. Useful for security audits.
SELECT 'Failed - ' + CONVERT(nvarchar(5), COUNT(Text)) + ' attempts' AS [Login Attempt], Text AS Details
FROM #TempLog 
where ProcessInfo = 'Logon' 
and Text like '%failed%'
Group by Text
--Find Last Successful login. Useful to know before deleting "obsolete" accounts.
SELECT Distinct 'Successful - Last login at (' + CONVERT(nvarchar(64), MAX(LogDate)) + ')' AS [Login Attempt], Text AS Details
FROM #TempLog 
where ProcessInfo = 'Logon' and Text like '%succeeded%'
and Text not like '%NT AUTHORITY%'
Group by Text
DROP TABLE #TempLog
DROP TABLE #logF