CentOS 7.2 64位 php5.4 启动start.php 出现Unknown error
换了端口启动，显示成功了，但使用不了。
麻烦看看这个怎么处理呢？

PHP Warning: stream_socket_server(): unable to connect to tcp://0.0.0.0:7272 (Unknown error) in /www/wwwroot/mobile/chat/vendor/workerman/workerman/Worker.php on line 1616

Warning: stream_socket_server(): unable to connect to tcp://0.0.0.0:7272 (Unknown error) in /www/wwwroot/mobile/chat/vendor/workerman/workerman/Worker.php on line 1616
PHP Fatal error: Uncaught exception 'Exception' in /www/wwwroot/mobile/chat/vendor/workerman/workerman/Worker.php:1618
Stack trace:

0 /www/wwwroot/mobile/chat/vendor/workerman/workerman/Worker.php(523): Workerman\Worker->listen()

1 /www/wwwroot/mobile/chat/vendor/workerman/workerman/Worker.php(416): Workerman\Worker::initWorkers()

2 /www/wwwroot/mobile/chat/start.php(28): Workerman\Worker::runAll()

3 {main}

thrown in /www/wwwroot/mobile/chat/vendor/workerman/workerman/Worker.php on line 1618

Fatal error: Uncaught exception 'Exception' in /www/wwwroot/mobile/chat/vendor/workerman/workerman/Worker.php:1618
Stack trace:

0 /www/wwwroot/mobile/chat/vendor/workerman/workerman/Worker.php(523): Workerman\Worker->listen()

1 /www/wwwroot/mobile/chat/vendor/workerman/workerman/Worker.php(416): Workerman\Worker::initWorkers()

2 /www/wwwroot/mobile/chat/start.php(28): Workerman\Worker::runAll()

3 {main}

thrown in /www/wwwroot/mobile/chat/vendor/workerman/workerman/Worker.php on line 1618