I have a laravel app that works fine with DB_HOST=localhost but does not work with DB_HOST=127.0.0.1. Does anyone know why this is happening ?

PDOException in PDOConnection.php line 43:
SQLSTATE[HY000] [2002] Permission denied

in PDOConnection.php line 43
at PDO->__construct('mysql:host=127.0.0.1;port=3306;dbname=ncorp', 'username', 'password', array('0', '2', '0',          false, false)) in PDOConnection.php line 43
at PDOConnection->__construct('mysql:host=127.0.0.1;port=3306;dbname=ncorp', 'username', 'password', array('0',   '2', '0', false, false)) in Connector.php line 116
at Connector->createPdoConnection('mysql:host=127.0.0.1;port=3306;dbname=ncorp', 'username', 'password',   array('0', '2', '0', false, false)) in Connector.php line 56
at Connector->createConnection('mysql:host=127.0.0.1;port=3306;dbname=ncorp', array('driver' => 'mysql', 'host'  => '127.0.0.1', 'port' => '3306', 'database' => 'ncorp', 'username' => 'username', 'password' => 'password', 'charset' =>     'utf8', 'collation' => 'utf8_unicode_ci', 'prefix' => '', 'strict' => true, 'engine' => null, 'name' => 'mysql'), array('0', '2', '0',   false, false)) in MySqlConnector.php line 24
at MySqlConnector->connect(array('driver' => 'mysql', 'host' => '127.0.0.1', 'port' => '3306', 'database' => 'ncorp',    'username' => 'username', 'password' => 'password', 'charset' => 'utf8', 'collation' => 'utf8_unicode_ci', 'prefix' => '',     'strict' => true, 'engine' => null, 'name' => 'mysql')) in ConnectionFactory.php line 126
at ConnectionFactory->Illuminate\Database\Connectors\{closure}()
at call_user_func(object(Closure)) in Connection.php line 965
at Connection->getPdo() in Connection.php line 986
at Connection->getReadPdo() in Connection.php line 423
at Connection->getPdoForSelect(true) in Connection.php line 333 
at Connection->Illuminate\Database\{closure}(object(MySqlConnection), 'select * from `users` where `email` = ?     limit 1', array('test@test.com')) in Connection.php line 763
at Connection->runQueryCallback('select * from `users` where `email` = ? limit 1', array('test@test.com'),  object(Closure)) in Connection.php line 726
at Connection->run('select * from `users` where `email` = ? limit 1', array('test@test.com'), object(Closure)) in   Connection.php line 351
at Connection->select('select * from `users` where `email` = ? limit 1', array('test@test.com'), true) in Builder.php  line 1648
at Builder->runSelect() in Builder.php line 1634
at Builder->get(array('*')) in Builder.php line 638 
at Builder->getModels(array('*')) in Builder.php line 327
at Builder->get(array('*')) in Builder.php line 297
at Builder->first() in EloquentUserProvider.php line 104
at EloquentUserProvider->retrieveByCredentials(array('email' => 'test@test.com', 'password' => 'secret')) in  SessionGuard.php line 353
at SessionGuard->attempt(array('email' => 'test@test.com', 'password' => 'secret'), false, false) in SessionGuard.php line 256
at SessionGuard->validate(array('email' => 'test@test.com', 'password' => 'secret')) in SessionGuard.php line 239
at SessionGuard->once(array('email' => 'test@test.com', 'password' => 'secret')) in AuthManager.php line 294
at AuthManager->__call('once', array(array('email' => 'test@test.com', 'password' => 'secret'))) in   IlluminateAuthAdapter.php line 39
at AuthManager->once(array('email' => 'test@test.com', 'password' => 'secret')) in IlluminateAuthAdapter.php line  39
at IlluminateAuthAdapter->byCredentials(array('email' => 'test@test.com', 'password' => 'secret')) in JWTAuth.php line 108
at JWTAuth->attempt(array('email' => 'test@test.com', 'password' => 'secret')) in Facade.php line 237
at Facade::__callStatic('attempt', array(array('email' => 'test@test.com', 'password' => 'secret'))) in AuthController.php line 22
at JWTAuth::attempt(array('email' => 'test@test.com', 'password' => 'secret')) in AuthController.php line 22  
at AuthController->authenticate(object(Request))
at call_user_func_array(array(object(AuthController), 'authenticate'), array(object(Request))) in Controller.php line 55
at Controller->callAction('authenticate', array(object(Request))) in ControllerDispatcher.php line 44
at ControllerDispatcher->dispatch(object(Route), object(AuthController), 'authenticate') in Route.php line 190
at Route->runController() in Route.php line 144
at Route->run(object(Request)) in Router.php line 653
at Router->Illuminate\Routing\{closure}(object(Request)) in Pipeline.php line 53
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in SubstituteBindings.php line 41
at SubstituteBindings->handle(object(Request), object(Closure)) in Pipeline.php line 137
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in ThrottleRequests.php line 49
at ThrottleRequests->handle(object(Request), object(Closure), '60', '1') in Pipeline.php line 137
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in Pipeline.php line 104
at Pipeline->then(object(Closure)) in Router.php line 655
at Router->runRouteWithinStack(object(Route), object(Request)) in Router.php line 629
at Router->dispatchToRoute(object(Request)) in Router.php line 607
at Router->dispatch(object(Request)) in Kernel.php line 268
at Kernel->Illuminate\Foundation\Http\{closure}(object(Request)) in Pipeline.php line 53
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in CheckForMaintenanceMode.php line 46
at CheckForMaintenanceMode->handle(object(Request), object(Closure)) in Pipeline.php line 137
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in Pipeline.php line 104
at Pipeline->then(object(Closure)) in Kernel.php line 150
at Kernel->sendRequestThroughRouter(object(Request)) in Kernel.php line 117
at Kernel->handle(object(Request)) in index.php line 54