Graylog - 无法写入套接字：fwrite（）：发送136个字节失败，错误为errno = 111拒绝连接（8）

Question

使用Gelf记录器记录警报时出现此错误。

的RuntimeException

Failed to write to socket: fwrite(): send of 136 bytes failed with errno=111 Connection refused (8)

代码

$transport = new UdpTransport("127.0.0.1", 6379, UdpTransport::CHUNK_SIZE_LAN);

$publisher = new Publisher();
$publisher->addTransport($transport);

$message = new \Gelf\Message();
$message->setShortMessage("Foobar!")
        ->setLevel(\Psr\Log\LogLevel::ALERT)
        ->setFullMessage("There was a foo in bar")
        ->setFacility("example-facility")
;

$publisher->publish($message);

$logger = new \Gelf\Logger($publisher, "example-facility");
$logger->alert("Foobaz!"); //getting error here
dd($logger);

我在这个端口6379上启动redis服务器。但不知道为什么我会遇到fwrite问题。