经过一番检查以及google,应该是SeLinux的导致的。可以选择一些两种方式进行：
1、关闭SeLinux,可以查看以下文章：
2、执行下面的命令
setsebool -P httpd_can_network_connect 1
原文地址：
解决Nginx的connect() to 127.0.0.1:8080 failed (13: Permission denied) while connect
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