Problem
Recently I experienced a situation where a SQL Server login failed with this error message:
Error: 18456, Severity: 14, State: 10.
Login failed for user ‘SQL_Login’. Reason: Password validation failed with an infrastructure error. Check for previous errors. [CLIENT: XXX.XXX.XXX.XXX].

Can you help me decipher this SQL Server issue and correct it? Check out this tip to learn more.

Solution
http://www.mssqltips.com/sqlservertip/2679/sql-server-login-failure-error-18456-severity-14-state-10/