Possible de connecter PHP a MS SQL Server mais impossible avec Symfony3

J'arrive a me connecter avec le code suivant (copier sur le site officiel de PHP):

Code:

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<?php
$serverName = "AMISSAH-PC\SQLEXPRESS"; //serverName\instanceName
 
// Since UID and PWD are not specified in the $connectionInfo array,
// The connection will be attempted using Windows Authentication.
$connectionInfo = array( "Database"=>"epayzone");
$conn = sqlsrv_connect( $serverName, $connectionInfo);
 
if( $conn ) {
 echo "Connection established.<br />";
}else{
 echo "Connection could not be established.<br />";
 die( print_r( sqlsrv_errors(), true));
}
?>

Mais avec Symfony3 :

Code:

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parameters:
database_driver: pdo_sqlsrv
database_host: AMISSAH-PC\SQLEXPRESS
database_port: 1433
database_name: epayzone
database_user: null
database_password: null
mailer_transport: smtp
mailer_host: 127.0.0.1
mailer_user: null
mailer_password: null
secret: ThisTokenIsNotSoSecretChangeIt

J'obtiens l'erreur suivant:

Code:

ConnectionException in AbstractMySQLDriver.php line 103: An exception occured in driver: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: No such host is known.