Description:
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Just trying to connect to MS sql server using mssql_connect, using the following line of code 

$conn = mssql_connect($DBServerName, $DBUser, $DBPassword);

If the length of variable $DBUser exceeds 30 characters, it returns the following error:login failed for user(null) : Reason : Not a trusted connection associated with SQL server was found.

Reproduce code:
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$conn = mssql_connect($DBServerName, $DBUser, $DBPassword);

mssql_select_db($DBName, $conn);

		}

Expected result:
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Database connection should succeed with any length of characters below the max string length acceptable in php.