无法与主机 smtp.gmail.com 建立连接 [权限被拒绝 #13]

Question

我正在使用 Laravel-5.1 进行开发。我的 .env 配置文件在 windows 8、4GB RAM 的开发环境中正常工作。当我部署到 Centos-6 的远程服务器时，我开始得到这个错误：

Swift_TransportException in StreamBuffer.php line 265:
Connection could not be established with host smtp.gmail.com [Permission denied #13]
in StreamBuffer.php line 265
at Swift_Transport_StreamBuffer->_establishSocketConnection() in StreamBuffer.php line 62
at Swift_Transport_StreamBuffer->initialize(array('protocol' => 'tcp', 'host' => 'smtp.gmail.com', 'port' => '587', 'timeout' => '30', 'blocking' => '1', 'tls' => true, 'type' => '1')) in AbstractSmtpTransport.php line 113
at Swift_Transport_AbstractSmtpTransport->start() in Mailer.php line 79
at Swift_Mailer->send(object(Swift_Message), array()) in Mailer.php line 395
at Mailer->sendSwiftMessage(object(Swift_Message)) in Mailer.php line 181
at Mailer->send('email.verify', array('users' => object(User), 'confirmation_code' => 'kdsEeEcS0wGI6YYyzPJqwa0ZM0i10t'), object(Closure)) in Facade.php line 222
at Facade::__callStatic('send', array('email.verify', array('users' => object(User), 'confirmation_code' => 'kdsEeEcS0wGI6YYyzPJqwa0ZM0i10t'), object(Closure))) in UserController.php line 70
at Mail::send('email.verify', array('users' => object(User), 'confirmation_code' => 'kdsEeEcS0wGI6YYyzPJqwa0ZM0i10t'), object(Closure)) in UserController.php line 70
at UserController->store(object(UserRequest))
at call_user_func_array(array(object(UserController), 'store'), array(object(UserRequest))) in Controller.php line 256
at Controller->callAction('store', array(object(UserRequest))) in ControllerDispatcher.php line 164
at ControllerDispatcher->call(object(UserController), object(Route), 'store') in ControllerDispatcher.php line 112
at ControllerDispatcher->Illuminate\Routing\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 139
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 103
at Pipeline->then(object(Closure)) in ControllerDispatcher.php line 114
at ControllerDispatcher->callWithinStack(object(UserController), object(Route), object(Request), 'store') in ControllerDispatcher.php line 69
at ControllerDispatcher->dispatch(object(Route), object(Request), 'App\Http\Controllers\UserController', 'store') in Route.php line 203
at Route->runWithCustomDispatcher(object(Request)) in Route.php line 134
at Route->run(object(Request)) in Router.php line 708
at Router->Illuminate\Routing\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 139
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 103
at Pipeline->then(object(Closure)) in Router.php line 710
at Router->runRouteWithinStack(object(Route), object(Request)) in Router.php line 675
at Router->dispatchToRoute(object(Request)) in Router.php line 635
at Router->dispatch(object(Request)) in Kernel.php line 236
at Kernel->Illuminate\Foundation\Http\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 139
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in VerifyCsrfToken.php line 50
at VerifyCsrfToken->handle(object(Request), object(Closure))
at call_user_func_array(array(object(VerifyCsrfToken), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 124
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in ShareErrorsFromSession.php line 49
at ShareErrorsFromSession->handle(object(Request), object(Closure))
at call_user_func_array(array(object(ShareErrorsFromSession), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 124
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in StartSession.php line 62
at StartSession->handle(object(Request), object(Closure))
at call_user_func_array(array(object(StartSession), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 124
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in AddQueuedCookiesToResponse.php line 37
at AddQueuedCookiesToResponse->handle(object(Request), object(Closure))
at call_user_func_array(array(object(AddQueuedCookiesToResponse), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 124
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in EncryptCookies.php line 59
at EncryptCookies->handle(object(Request), object(Closure))
at call_user_func_array(array(object(EncryptCookies), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 124
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in CheckForMaintenanceMode.php line 44
at CheckForMaintenanceMode->handle(object(Request), object(Closure))
at call_user_func_array(array(object(CheckForMaintenanceMode), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 124
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 103
at Pipeline->then(object(Closure)) in Kernel.php line 122
at Kernel->sendRequestThroughRouter(object(Request)) in Kernel.php line 87
at Kernel->handle(object(Request)) in index.php line 54

这是 .env 配置文件：

APP_ENV=local
APP_DEBUG=true
APP_KEY=app_key_many_digits

DB_HOST=remotehost
DB_DATABASE=mydatabase
DB_USERNAME=mysqlusername
DB_PASSWORD=mysqlpassword

CACHE_DRIVER=file
SESSION_DRIVER=file
QUEUE_DRIVER=sync

MAIL_DRIVER=smtp
MAIL_HOST=smtp.gmail.com
MAIL_PORT=587
MAIL_USERNAME=myemail@gmail.com
MAIL_PASSWORD=mypassword
MAIL_ENCRYPTION=tls

我不知道在 Centos-6 上是否默认配置了 smtp，或者我需要配置它，如果是，请指导我如何配置。

Answer 1

希望这对你有帮助，我为此花了很多时间。

我的解决方案原来是 SELinux 导致的问题。 这适用于 RedHat/CentOS 6.

允许 HTTPD（即 PHP）建立网络套接字连接

setsebool -P httpd_can_network_connect on

允许 HTTPD（即 PHP）发送邮件。

setsebool -P httpd_can_sendmail on

参考文献：

RedHat page about Security Enhanced Linux

Sending email with Swift Mailer, GMail and PHP, Permission Denied Error

Instructions on how to enable sendmail (and mail) for local system.