Unable to complete login process due to delay in opening server connection

I am Connecting yii.1 with mssql

and written code to retrieve data from server, when i run the index it give error :

CDbConnection failed to open the DB connection: SQLSTATE[08001]: [Microsoft][ODBC Driver 11 for SQL Server]Unable to complete login process due to delay in opening server connection

in main.php

‘db’=>array(

		// 'class'=>'application.components.MsSqlConnection',


		'connectionString' => 'sqlsrv:Server=xyz\SQLSERVER2012;Database=zbc',


		// 'emulatePrepare' => false,


		'username' => 'pqr',


		'password' => 'xyz',


		'charset' => 'utf8',


		'tablePrefix' => 'tbl',


	),

in index.php

$conn = Yii::app()->db;

$command = $conn->createCommand("select * from tbl_user");

$dataReader =$command->query();

foreach ($dataReader as $row) {

echo ">".$row['username']."<br>";

Thanks in advance.

its working …